whats the answer to 9? i really need help with this in the next 20 minutes. ty if u help me!

Whats The Answer To 9? I Really Need Help With This In The Next 20 Minutes. Ty If U Help Me!

Answers

Answer 1

Answer:

A very precise number B

Explanation:

Hope you pass


Related Questions

You're visiting a Computer Science building at a college, and they've decided it'd be fun to display all the room numbers in binary. You're going to room 13.What binary number should you look for on the door?

Answers

Answer:

1101 its the 4 bit binary number...

Which of the following tasks can you complete with ggplot2 features? Select all that apply.
A. Automatically clean data before creating a plot
B. Customize the visual features of a plot
C. Add labels and annotations to a plot
D. Create many different types of plots

Answers

The tasks that can be completed with ggplot2 features are: B. Customize the visual features of a plot, C. Add labels and annotations to a plot, and D. Create many different types of plots.

ggplot2 is a powerful data visualization package in R that provides a wide range of features for creating and customizing plots. It allows users to modify various visual aspects of a plot, such as colors, shapes, sizes, and themes, providing flexibility in designing visually appealing and informative plots. Additionally, ggplot2 allows for the addition of labels and annotations to enhance the understanding of the plot.

This includes adding axis labels, titles, legends, and text annotations to highlight important points or provide additional context. Furthermore, ggplot2 supports the creation of different types of plots, including scatter plots, bar charts, line graphs, histograms, and more, enabling users to represent and explore their data in various ways.

However, it's important to note that ggplot2 does not automatically clean data before creating a plot. Data cleaning tasks, such as removing missing values or outliers, are typically performed separately using other data manipulation techniques or packages before utilizing ggplot2 for visualization

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A formula in cell D1 of this spreadsheet gives a result of 3. Which formula
was most likely entered in cell D1?

A formula in cell D1 of this spreadsheet gives a result of 3. Which formulawas most likely entered in

Answers

The duplicated formulas in cells G3 and E3 are =E3+F$3 and =$B3+D3, respectively. The contents of cell C1 will be 44, the value shown in cell E1 will be -40, and the result we will obtain is 7.

What does an Excel formula go by?

Using specified values, referred to as inputs, in a given order, or structure, functions are established formulas that carry out calculations. Simple or sophisticated computations can be carried through using functions.

Which of the three formula kinds are they?

Chemical formulas can be divided into three categories: empirical, molecular, and structural. Molecular formulas indicate the number of each type of atom in a molecule, empirical formulas display the simplest whole-number ratio of atoms in a compound, and structural formulas display the number of each type of atom in a compound.

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BRAINLEST PLEASE HELP
Which action is an example of networking?

meeting other business students from other schools at an FBLA conference
helping organize donations at a food pantry
entering your program in a contest
taking the exam for a certification

Answers

meeting other business students because networking is meeting with other and discussing information

Answer:

A (First one)

Explanation:

Meeting other business students from other schools at an FBLA conference.

In order to draw a shape on the stage, what does the following function need? Move 100 steps, turn right 90 degrees with four iterations.

Event block with the commands when space key pressed, then draw square

If-then block with the commands if draw square, then run function

Known initial condition using the pen down command

Loop block with 2 iterations

Answers

To draw a square on the stage using the function described, the below elements are needed:

What is the function  about?

The elements  are:

A "Move 100 steps, turn right 90 degrees" block to move the pen forward and turn it to the right at each corner of the square.

An event block that listens for the "space key pressed" event, and triggers the drawing of the square when this event occurs.

An "If-then" block that checks whether the "draw square" variable is true, and executes the function to draw the square if it is.

A pen down command to ensure that the pen is in contact with the stage and draws a visible line.

A loop block with 2 iterations to repeat the process of moving forward and turning right at each corner of the square.

Once all of these elements are in place, the function will be able to draw a square on the stage when the "space key pressed" event is triggered, and the "draw square" variable is true.

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how does python show that commands belong inside a python structure?

Answers

Python show that commands belong inside a Python structure by using indentation to define the code blocks.

What is Python?

Python can be defined as a high-level programming language that is designed and developed to build websites and software applications, especially through the use of dynamic commands (semantics) and data structures.

In Computer programming, Python show that commands belong inside a Python structure by using indentation to define the code blocks.

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List 3 ways that you can customise a form?

Answers

Answer:

In MS Access a form is a database object that is used for the for the display, editing, or entering of data into a relational database or table

A form can be customized in in different ways with MS Access, as outlined by the Information Technology Services document on the University of Illinois Springfield website in including;

1) Adding/adjusting the controls

2) Adjusting the order of the Tabs

3) Using the Tab Controls

Explanation:

Which type of choir often sings AND dances while they perform?
Group of answer choices

Advanced Choir

Show Choir

Beginning Choir

Boys Choir music

Answers

Advanced Choir multip
Which type of choir often sings AND dances while they perform?Group of answer choicesAdvanced ChoirShow

What genre do games that involve physical challenges and make use of hand-eye coordination, speed, accuracy, and precision fall into?
adventure
action
simulation
puzzle

Answers

Answer:

flexiblity

feedback

playin outdoor game

Answer:

I think simulation not 100% sure though.

How can you tell if a website is credible?
a. Anything on the web is automatically credible
b. You must review aspects of the site such as the author’s credibility
c. If it has a top-level domain of .com, it is credible
d. All of the above

Answers

Answer:

b

Explanation:

you must review everything, creditability , certificates, domains, etc

You can tell a website is credible by reviewing its aspects overall, the answer is b.

Which of the following is true? a. Pseudocode is used to describe an algorithm. b. Pseudocode is not an actual computer programming language. c. Pseudocode is used to describe executable statements that will eventually be translated by the programmer into a program. d. All of the above.

Answers

Answer:

Correct answer is:

d. All of the above

Explanation:

First of all, let us learn about a pseudo code:

Pseudo code: It is an implementation of any algorithm written with the help of annotations and text using in simple English. (So, point a. is true)

It is written in English so its syntax is not like any actual programming language. (So, point b. is true)

Pseudo code describes what each line of pseudo code will do so the code writing becomes easier simply by translating the pseudo code to actual programming language syntax i.e. point c. is true.

Hence, point "d. All of the above" is true.

Advantages of Pseudo code :

It makes the readability of the program idea/approach better.Code writing becomes easier for the programmer.

Correct answer is:

d. All of the above

The concurrent process model defines a set of "states." describe what these states represent in your own words, and then indicate how they come into play within the concurrent process model.

Answers

Answer:

Explanation:

Concurrent Process model can be regarded as evolutionary process model as well as software engineering is concerned, it allows to know the current state of activities as well as their associated states.

The set of states In the concurrent process model are:

✓awaiting changes

✓Inactive

✓baselined

✓under development

✓under revision

✓under review

✓done

The stated "states" above give a representation of externally observable mode as regards to the behaviour of activities of a particular software engineering.

The existence of activities of software engineering do exist at same period

In concurrent process model, though each of the activities occur in different states so that process network is produced. The movement from one state to another of activity of software engineering is as a result of

predefined events.

a client is requesting an internet connection type that is not affected by atmospheric conditions and is always on. which of the following will meet these requirements? a. dial-up b. cable c. satellite d. cellular hotspot

Answers

A client is requesting an internet connection type that is not affected by atmospheric conditions and is always on. The answer choice that will meet these requirements is a satellite

What is a Satellite Connection?

Satellite internet is a wireless link made up of several satellite dishes that can be found both on Earth and in space.

It gives isolated regions of the world useful access to major networks. They remain connected as a result, giving them access to modern information and communication networks.

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What is the best CPU you can put inside a Dell Precision T3500?

And what would be the best graphics card you could put with this CPU?

Answers

Answer:

Whatever fits

Explanation:

If an intel i9 or a Ryzen 9 fits, use that. 3090's are very big, so try adding a 3060-3080.

Hope this helps!

an exception's default error message can be retrieved by using the ________ method.

Answers

The default error message of an exception can be retrieved by using the getMessage() method.

In many programming languages, including Java, exceptions provide a means to handle errors and unexpected situations in code. When an exception occurs, it typically includes an error message that describes the cause of the exception.

To access this default error message, you can use the getMessage() method provided by the exception object. By invoking this method, you can retrieve the error message as a string and use it for logging, displaying to the user, or further error handling.

The getMessage() method is a common feature of exception classes and is available in various programming languages, allowing developers to easily access and utilize the default error messages associated with exceptions.

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the guidance system of a ship is controlled by a computer that has three major modules. in order for the computer to function properly, all three modules must function. two of the modules have reliabilities of .95, and the other has a reliability of .99. a. what is the reliability of the computer? (round your answer to 4 decimal places.) b. a backup computer identical to the one being used will be installed to improve overall reliability. assuming the new computer automatically functions if the main one fails, determine the resulting reliability. (round your intermediate calculations and final answer to 4 decimal places.) c. if the backup computer must be activated by a switch in the event that the first computer fails, and the switch has a reliability of .97, what is the overall reliability of the system? (both the switch and the backup computer must function in order for the backup to take over.) (round your intermediate calculations and final answer to 4 decimal places.)

Answers

Computer reliability, in its simplest terms, means your machine works as expected

What is an example of dependability in a computer?

Last copy recall is an example of a high reliability attribute, which means that as long as at least one copy of a message is accessible at any of the receivers, every other recipient who does not fail ultimately receives a copy as well.

In its most basic form, computer dependability implies that your machine performs as intended. After pressing the power button, the computer screen illuminates, and the operating system, applications, and apps work normally. Dependability measures may be used to calculate reliability. Reliability is the study of ensuring the proper operation of computer systems even when individual hardware and software components fail.

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one problem with mail surveys is non-response bias. whaty does this means?

Answers

Mail surveys are one of the most efficient and cost-effective methods of collecting feedback and conducting market research. However, non-response bias is one of the problems associated with mail surveys.

In research, bias is a systematic error that occurs when the findings of a study are not representative of the population being studied. Non-response bias refers to the bias that occurs when the sample of respondents who did not respond to a survey differs from those who did respond, and this difference in the sample affects the validity of the results obtained.

Non-response bias can be caused by several factors, such as the following: A lack of interest in the subject matter: A recipient may not be interested in the subject matter being studied, and this may lead to non-response. The complexity of the questionnaire: If the questionnaire is complex and difficult to understand, respondents may not complete the survey. The survey's length: If the survey is too long, respondents may not complete the survey due to a lack of time or patience.

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Non-response bias refers to a systematic error that arises in survey research when the results obtained from the people who respond to a survey are significantly different from the results that would have been obtained if the entire population of interest had participated in the survey.

Respondents that do not respond are typically different from those who do respond. This implies that the characteristics of the respondents who participate in the survey are not representative of the population. If the proportion of respondents who respond is not representative of the population, the survey results may be biased.To summarize, Non-response bias in survey research can lead to systematic errors. Non-response bias is a systematic error that can arise in survey research when the results obtained from the people who respond to a survey are significantly different from the results that would have been obtained if the entire population of interest had participated in the survey. Non-respondents are typically different from those who do respond. As a result, the characteristics of the respondents who participate in the survey may not be representative of the population. Non-response bias can make survey results unreliable. Therefore, researchers must take steps to minimize non-response bias in their surveys to obtain more accurate and reliable results.

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.IP telephony and Voice over IP (VoIP) are identical.
False or true?

Answers

False. IP telephony and Voice over IP (VoIP) are not identical; VoIP is a specific technology that falls under the broader category of IP telephony.

The statement is false. IP telephony and Voice over IP (VoIP) are related but distinct concepts. IP telephony encompasses any telephony system that uses IP networks to transmit voice calls, including both traditional telephony systems that have been migrated to IP-based infrastructure and newer VoIP systems.

Voice over IP (VoIP) specifically refers to a technology that allows voice communications to be transmitted over IP networks, such as the internet. VoIP utilizes packet-switched networks to convert analog voice signals into digital packets and transmit them as data packets over IP networks. It enables voice communication to be integrated with other data services and offers advantages such as cost savings and flexibility.

While VoIP is a significant component of IP telephony, IP telephony also includes other technologies and protocols that facilitate voice communication over IP networks. This may include IP-based private branch exchange (IP-PBX) systems, session initiation protocol (SIP) for call signaling, and other related technologies.

In summary, IP telephony is a broader term that encompasses various telephony systems using IP networks, while VoIP specifically refers to the technology of transmitting voice calls over IP networks.

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anyone pls answer this!!!!!!thanks ^-^​

anyone pls answer this!!!!!!thanks ^-^

Answers

Answer:

True

False

False

False

Explanation:

HTML isnt a scripting a scripting language it's a markup language

There are 6 levels of HTML

An empty tag only has a starting tag

01000111 01110101 01100101 01110011 01110011 00100000 01110111 01101000 01100001 01110100 00111111

Answers

12435 425 2 52 35 Guess what?

WILL GIVE BRAINLIEST IF DONE CORRECT
Write a program in PYTHON that will simulate an ATM machine. A user at this ATM machine can do one of 5 things:

1 – Deposit (adding money to the account)
2 – Withdrawal (removing money from the account)
3 – Balance Inquiry (check current balance)
4 – Transfer Balance (transfer balance from one account to another)
5 – Log Out (exits/ends the program)

Before a user can do any of those things, he/she must first enter his/her username and passcode. After 3 incorrect attempts at entering the username and password, the program will end. The list of legitimate users along with their user ID, passcode, and account balance is shown below.

Customer, Username, Password, Savings Account, Checking Account
Robert Brown, rbrown, blue123, $2500.00, $35.00
Lisa White, lwhite, red456, $500.00, $1250.00
Mark Black, mblack, green789, $750.00, $200.00


Once the user enters the username, password, and option choice correctly, process the transaction according to these rules:
Allow the user to make up to a maximum of 3 transactions at a time. After 3 transactions, the program will terminate and they must log in again.
After a transaction is completed, the program will update the running balance and give the customer a detailed description of the transaction. A customer cannot overdraft on their account; if they try to withdraw more money than there is, a warning will be given to the customer.

Also, note that the ATM doesn’t distribute or collect coins – all monetary values are in whole dollars (e.g. an integer is an acceptable variable type). Any incorrect transaction types will display an appropriate message and count as a transaction.

Answers

Answer:

import sys

#account balance

account_balance = float(500.25)

##prints current account balance

def printbalance():

  print('Your current balance: %2g'% account_balance)

#for deposits

def deposit():

 #user inputs amount to deposit

 deposit_amount = float(input())

 #sum of current balance plus deposit

 balance = account_balance + deposit_amount

 # prints customer deposit amount and balance afterwards

 print('Deposit was $%.2f, current balance is $%2g' %(deposit_amount,

balance))

#for withdrawals

def withdraw():

 #user inputs amount to withdraw

 withdraw_amount = float(input())

 #message to display if user attempts to withdraw more than they have

 if(withdraw_amount > account_balance):

   print('$%.2f is greater than your account balance of $%.2f\n' %

(withdraw_amount, account_balance))

 else:

   #current balance minus withdrawal amount

   balance = account_balance - withdraw_amount

   # prints customer withdrawal amount and balance afterwards

   print('Withdrawal amount was $%.2f, current balance is $%.2f' %

(withdraw_amount, balance))

#system prompt asking the user what they would like to do

userchoice = input ('What would you like to do? D for Deposit, W for

Withdraw, B for Balance\n')

if (userchoice == 'D'): #deposit

 print('How much would you like to deposit today?')

 deposit()

elif userchoice == 'W': #withdraw

 print ('How much would you like to withdraw today?')

elif userchoice == 'B': #balance

 printbalance()

else:

 print('Thank you for banking with us.')

 sys.exit()

Answer:

account_balance = float(500.25)  print('Your current balance: %2g'% account_balance)  ('Deposit was $%.2f, current balance is $%2g' %(deposit_amount, balance)) print('$%.2f is greater than your account balance of $%.2f\n' % (withdraw_amount, account_balance))('Withdrawal amount was $%.2f, current balance is $%.2f' %  (withdraw_amount, balance)) ('How much would you like to deposit today?') ('How much would you like to withdraw today?') ('Thank you for banking with us.')

Explanation:

The simple answer

adapt boolean maze.findmazepath() so that it returns the shortest path in the list of paths. the resulting method should be called

Answers

If a class doesn't override the interface's default concrete implementations, the class receives them when it implements the interface.

In Java SE 8, default methods—public methods with actual implementations that describe how an operation should be carried out—may be declared in an interface. Using the term interface, a specific class type that only has abstract methods is declared. The interface must be "implemented" (kind of like inherited) by another class using the implements keyword in order to access the interface functions (instead of extends ). A class or interface can serve as the base type. The "extends" keyword can be used to implement interface inheritance.

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How do you clear/remove a print area that has already been defined on the worksheet?.

Answers

The Click on  worksheet whose print area you want to remove. On the Page Layout tab, under Page Setup, click Clear Print Area.

What is worksheet?

The term Worksheet used in Excel documents is a collection of cells arranged in rows and columns. This is the desktop you use to enter data. Each worksheet contains 108576 rows and 1638columns and acts as a giant table that  you can use to organize your data. Typically, a workbook contains several worksheets with related content, and only one of the worksheets is active at a time.

The most important features of worksheets can be summarized in the following list:

Cells: The Cells function allows you to add, edit and delete cells in a worksheet. Rows and Columns: The Worksheet API  allows you to add, edit and delete rows and columns. In addition, you can adjust the height of certain rows and the width of columns. Names (Name Regions): The Worksheet class exposes a Names property of type Name Collection, which allows you to create, update and manage names.

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explain drawing and painting package.​

Answers

Enhances drawing experiences, adds more features and adds better quality
explain drawing and painting package.

help I don’t even know what class is this.

help I dont even know what class is this.

Answers

Answer:

I would say D

Explanation:

Computers are often used to create financial model. One of the features which make a spreadsheet suitable for this is the ability to handle both text and numbers.name three other features which make them suitable for this purpose

Answers

Explanation:

yvyvuvuvyybububububgy thewin at the end

Here are a couple reasons for using spreadsheets.

Budgeting and spending help

Business administrative tasks

Generating reports and charts

Calculation and accounting uses

Data exports, sifting, and cleanup

I hope this helps.

How do data packets travel through fiber optic cables?

as light pulses through glass strands

as voltage changes through copper wires

as light pulses through copper wires

as voltage changes through glass strands

Answers

As light pulses through glass strands, data packets travel through fiber optic cables. Option A is correct .

Through fiber optic cables, how do data packets travel?

Fiber-optic links send information by means of quick voyaging beats of light. The central fiber is surrounded by a second layer of glass known as "cladding." This layer causes light to repeatedly bounce off the walls of the cable rather than leak out at the edges, allowing the single fiber to travel further without being affected. By repeatedly bouncing off the cable's walls, light travels down a fiber optic cable. With continued internal mirror-like reflection, each light particle (photon) bounces down the pipe. The light beam descends the cable's core. The cable and the glass structure meet in the middle in the core. Light is propagated through fiber optic cables by means of glass strands. Signals for communication travel between devices via light pulses. The propagated light is carried by a small inner core located in the center of the fiber optic strand.

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in a fluid power Domanda 18 Risposta non ancora data Punteggio max 1.50 PContrassegna domanda In a fluid power system, an hydraulic motor receives a flow rate Q-40 L/min. The volumetric efficiency is n, 0.90, the mechanical- hydraulic efficiency is 0.88, the motor displacement is 25 cm /rev. The speed of the motor is O(A) 1408 rpm O(B) 1778 rpm O (C) 1600 rpm O (D) 1440 rpm

Answers

Given data,Flow rate Q = 40 L/minVolumetric efficiency n = 0.90Mechanical hydraulic efficiency = 0.88Motor displacement = 25 cm/revWe can calculate the speed of the hydraulic motor using the following formula:

Q = (60 x n x V x d) / (1000 x T)Where,Q = Flow rate (L/min)n = Volumetric efficiencyV = Piston displacement (cc/rev)T = Time (min)d = mechanical hydraulic efficiencyFormula to calculate speed of the hydraulic motor,N = (Q x 1000 x T) / (60 x n x V x d)We need to find the speed of the motor, which is represented by NSubstituting given values in the above formula,

N = (40 x 1000 x 1) / (60 x 0.9 x 25 x 0.88)N = 1777.5 rpmHence, the main answer is (B) 1778 rpm. We have calculated the speed of the hydraulic motor to be 1777.5 rpm, which is nearest to 1778 rpm, therefore, option (B) is the correct answer.

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Space Systems are shared and interconnected systems of computers, communications, people, and other support structures that

Answers

Answer:

Include command and control, tactical, intelligence, and commercial communications systems used to transmit DOD data

Explanation:

Space systems are a network of tools and people meant for the proper functioning of the a space sector of the security system and includes several dedicated and shared technologies and resources that are mainly outlined for efficient and economical usage.

Space systems facilitate systems public and private systems that require space to land based technologies.

The purpose of project management is _____. executing a requirement improvement working toward a common goal completing a project

Answers

Answer:

working toward a common goal.

Explanation:

Project management can be defined as the process of designing, planning, developing, leading and execution of a project plan or activities using a set of skills, tools, knowledge, techniques and experience to achieve the set goals and objectives of creating a unique product or service.

Generally, projects are considered to be temporary because they usually have a start-time and an end-time to complete, execute or implement a project plan.

Furthermore, the main purpose of project management is working toward a common goal.

This ultimately implies that, project managers should ensure adequate attention and time is taken to identify, analyze and manage capital, raw materials, people, system of tasks and other resources, so as to effectively and efficiently achieve a common goal with all project stakeholders.

The fundamentals of Project Management which are universal across all fields and businesses includes;

1. Project initiation.

2. Project planning.

3. Project execution.

4. Monitoring and controlling of the project.

5. Adapting and closure of project.

In conclusion, it is very important and essential that project managers in various organizations, businesses and professions adopt the aforementioned fundamentals in order to successfully achieve their aim, objectives and goals set for a project.

Other Questions
listen to the conversation between manuel and ana. then indicate whether the following conclusions are lgico or ilgico, based on what you heard. Show that if p is an odd prime , then 2(p-3)! congruent to -1(mod p) four glasses of milk and 3 snack bars have a total of 74 carbohydrates(carbs), and 2 glasses of milk and 4 snack bars have a total of 62 carbs. determine how many carbs are in 1 glass of milk and in one snack bar Compare the volumes of the right prism and the oblique prism. Explain.Look at the picture to answer.Also this is worth 100 points(you get 50, and more if your answer is good and I Brainliest you (if that makes any sense)) A main function of the reality therapist is to encourage clients to assess their behavior to determine how well it is working for them. Mauna loa, a volcano in hawaii, is an excellent example of a ________. -36 (-10) - (18). I need the answer please!! 10) Scientists should base their findings on facts rather than opinions.TrueFalse11) If a sample is too small, the results might not be accurate.TrueFalse What is a formula for the nth term of the given sequence?-3 , 4 , 11 What effect does 'h' have on the graph of a parabola?Vertical stretchVertical compressionVertical shiftHorizontal shift Consider a social issue situated around family, education, transportation, or finances. Think like a social scientist such as a conflict theorist, functionalist, or symbolic interactionist by choosing a theoretical perspective that helps you explain the social issue. Then discuss why the theoretical perspective you chose is appropriate to use. HELPPP QUICK PLSS NO BOTS EITHER I WILL REPORT BUT PLS DONT IGNORE THIS HELP ME PLSS In the slope-intercept equation for a line the coefficient of the x-term gives the Simplify the equation TRUE / FALSE. the number of sequencer steps can be increased by connecting two sequencers in a cascading arrangement. When was the Butler Act passed? WHO WANT'S 100 BRAINLY POINTS?!!!What is the slope of the line that passes through the points (3,2) and (-1,-4)? Write your answer as a fraction in simplest form? Write the answer as it is in the bracket. The stored form of energy based on an object's position is called....?1) Thermal Energy2) Kinetic Energy3) Radiant Energy4) Potential Energy WILL GIVE BRAINLIEST 60 POINTS Use the polygon tool to draw a right triangle with hypotenuse AB. Research has revealed that, on average, only _____ percent of college students are actively listening during a college lecture. STORIES OF USEFUL INVENTIONS, excerptBy S. E. Forman1911THE MATCHPLESE HELP WITH IT !!There never was a time when the world was without fire, but there was a time when men did not know how to kindle fire; and after they learned how to kindle one, it was a long, long time before they learned how to kindle one easily. In these days we can kindle a fire without any trouble, because we can easily get a match; but we must remember that the match is one of the most wonderful things in the world, and that it took men thousands of years to learn how to make one. Let us learn the history of this familiar little object, the match.Fire was first given to man by nature itself. When a forest is set on fire by cinders from a neighboring volcano, or when a tree is set ablaze by a thunderbolt, we may say that nature strikes a match. In the early history of the world, nature had to kindle all the fires, for man by his own effort was unable to produce a spark. The first method, then, of getting fire for use was to light sticks of wood at a flame kindled by natureby a volcano, perhaps, or by a stroke of lightning. These firebrands were carried to the home and used in kindling the fires there. The fire secured in this way was carefully guarded and was kept burning as long as possible. But the flame, however faithfully watched, would sometimes be extinguished. A sudden gust of wind or a sudden shower would put it out. Then a new firebrand would have to be secured, and this often meant a long journey and a deal of trouble.In 1827, John Walker, a druggist in a small English town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. The druggist had discovered the first friction-chemical match, the kind we use to-day. It is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. Although Walker's match did not require the bottle of acid, nevertheless it was not a good one. It could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. In a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. The match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. It would ignite when rubbed on any dry surface, and there was no longer any sputtering. This was the phosphorus match, the match with which we are so familiar.please help with it.What is the main idea of the second paragraph