Answer:
Purplemath
First you learned (back in grammar school) that you can add, subtract, multiply, and divide numbers. Then you learned that you can add, subtract, multiply, and divide polynomials. Now you will learn that you can also add, subtract, multiply, and divide functions. Performing these operations on functions is no more complicated than the notation itself. For instance, when they give you the formulas for two functions and tell you to find the sum, all they're telling you to do is add the two formulas. There's nothing more to this topic than that, other than perhaps some simplification of the expressions involved.
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Given f (x) = 3x + 2 and g(x) = 4 – 5x, find (f + g)(x), (f – g)(x), (f × g)(x), and (f / g)(x).
To find the answers, all I have to do is apply the operations (plus, minus, times, and divide) that they tell me to, in the order that they tell me to.
(f + g)(x) = f (x) + g(x)
= [3x + 2] + [4 – 5x]
= 3x + 2 + 4 – 5x
= 3x – 5x + 2 + 4
= –2x + 6
(f – g)(x) = f (x) – g(x)
= [3x + 2] – [4 – 5x]
= 3x + 2 – 4 + 5x
= 3x + 5x + 2 – 4
= 8x – 2
(f × g)(x) = [f (x)][g(x)]
= (3x + 2)(4 – 5x)
= 12x + 8 – 15x2 – 10x
= –15x2 + 2x + 8
\left(\small{\dfrac{f}{g}}\right)(x) = \small{\dfrac{f(x)}{g(x)}}(
g
f
)(x)=
g(x)
f(x)
= \small{\dfrac{3x+2}{4-5x}}=
4−5x
3x+2
Step-by-step explanation:
Purplemath
First you learned (back in grammar school) that you can add, subtract, multiply, and divide numbers. Then you learned that you can add, subtract, multiply, and divide polynomials. Now you will learn that you can also add, subtract, multiply, and divide functions. Performing these operations on functions is no more complicated than the notation itself. For instance, when they give you the formulas for two functions and tell you to find the sum, all they're telling you to do is add the two formulas. There's nothing more to this topic than that, other than perhaps some simplification of the expressions involved.
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Need a personal math teacher?
Given f (x) = 3x + 2 and g(x) = 4 – 5x, find (f + g)(x), (f – g)(x), (f × g)(x), and (f / g)(x).
To find the answers, all I have to do is apply the operations (plus, minus, times, and divide) that they tell me to, in the order that they tell me to.
(f + g)(x) = f (x) + g(x)
= [3x + 2] + [4 – 5x]
= 3x + 2 + 4 – 5x
= 3x – 5x + 2 + 4
= –2x + 6
(f – g)(x) = f (x) – g(x)
= [3x + 2] – [4 – 5x]
= 3x + 2 – 4 + 5x
= 3x + 5x + 2 – 4
= 8x – 2
(f × g)(x) = [f (x)][g(x)]
= (3x + 2)(4 – 5x)
= 12x + 8 – 15x2 – 10x
= –15x2 + 2x + 8
\left(\small{\dfrac{f}{g}}\right)(x) = \small{\dfrac{f(x)}{g(x)}}(
g
f
)(x)=
g(x)
f(x)
= \small{\dfrac{3x+2}{4-5x}}=
4−5x
3x+2
For each relation, indicate whether the relation is a partial order, a strict order, or neither. If the relation is a partial or strict order, indicate whether the relation is also a total order. Justify your answers.
(a)
The domain is the set of all words in the English language (as defined by, say, Webster's dictionary). Word x is related to word y if x appears before y in alphabetical order. Assume that each word appears exactly once in the dictionary.
The domain is the set of all words in the English language that has a partial order relation and not a total order relation.
Given:
The domain is the set of all words in the English language (as defined by, say, Webster's dictionary.
Assume,
The domain is the set of all words in the English language (as defined by, say, Webster's dictionary). Word x is related to word y if x appears as a substring of y. x is a substring of y if all the letters in x appear in consecutive order somewhere in y. For example, "logical" is a substring of "topological" because the letters l-o-g-i-c-a-l appear consecutively in the order of the word "topological". However, "local" is not a substring of "topological" because the letters l-o are separated from c-a-l by the letters g and i.
Now, x is related to y if x is a substring of y.
Considering the following points through the example:
(A) Clearly, x is a substring of itself. Therefore, x is related to x and hence it is called reflexive.
(B) If x is related to y or y is related to x then x =y and it is called antisymmetric.
(C) If x is related to y and y is related to û then we can say that x is related to û (i.e. if x is a substring of y and y is a substring of û then x is also inscribed in û. Hence, we called it transitive.
Hence, the order is not the total order relation. It is a partial order relation.
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If you are constructing a 95% confidence interval for a sample of size 100, what value of 2a/2 should you use?(round to two decimal places) Question 4 2 pts A government agency was charged by the legislature with estimating the length of time it takes citizens to fill out various forms. The agency generated an 85% confidence interval, a 90% confidence interval, and a 99% confidence interval, all of which are listed below. Which one is the 85% confidence interval? . (12.49, 13.11) (12.63, 12.97) . (12.60, 13.00) Question 5 2 pts A random sample of 54 students from a large university yields mean GPA 2.70 with sample standard deviation 0.50. Construct a 99% confidence interval for the mean GPA of all students at the university. ° 2.70 + (1.280) (0.5%) 754. ° 2.70 + (1.645) (959) ° 2.70 + (1.771) (0,52) ° 2.70 + (1.960) (050) 2.70 + (2.576) (0:50)
The 99% confidence interval for the mean GPA of all students at the university is (2.558, 2.842).
For a sample of size 100 and a 95% confidence interval, the value of 2a/2 is:
2a/2 = 1 - 0.95 = 0.05
Rounding to two decimal places, we get 2a/2 = 0.05.
Therefore, the answer to question 4 is:
The 85% confidence interval is (12.60, 13.00).
For question 5, we can use the formula:
CI = X ± zα/2 * (s/√n)
where X is the sample mean, s is the sample standard deviation, n is the sample size, and zα/2 is the z-score corresponding to the desired level of confidence.
Substituting the given values, we get:
CI = 2.70 ± 2.576 * (0.50/√54)
Calculating this expression, we get:
CI = (2.558, 2.842)
Therefore, the 99% confidence interval for the mean GPA of all students at the university is (2.558, 2.842).
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The 99% confidence interval for the mean GPA of all students at the university is (2.558, 2.842).
For a sample of size 100 and a 95% confidence interval, the value of 2a/2 is:
2a/2 = 1 - 0.95 = 0.05
Rounding to two decimal places, we get 2a/2 = 0.05.
Therefore, the answer to question 4 is:
The 85% confidence interval is (12.60, 13.00).
For question 5, we can use the formula:
CI = X ± zα/2 * (s/√n)
where X is the sample mean, s is the sample standard deviation, n is the sample size, and zα/2 is the z-score corresponding to the desired level of confidence.
Substituting the given values, we get:
CI = 2.70 ± 2.576 * (0.50/√54)
Calculating this expression, we get:
CI = (2.558, 2.842)
Therefore, the 99% confidence interval for the mean GPA of all students at the university is (2.558, 2.842).
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A circle has an area of 314.1592. What is the diameter? (round to the nearest whole number)
Answer:
20
Step-by-step explanation:
The area of a circle is equal to pi*radius^2
We can then write this as
314.1592=π*r^2
We then divide pi to get
100=r^2
take the square root and you find that the radius equals around 10
The diameter is always equal to the radius times two which means that the diameter is 20
hope this helps
The curve of best fit is given as y = 4 + 3x + 2x2. Find the value of y when x = 2
A consumers group is concerned with the mean cost of dining in a particular restaurant. a random sample of 40 charges (in dollars) per person has a mean charge of $39. 7188 with standard deviation of $3. 5476. is there sufficient evidence to conclude that the mean cost per person exceeds $38. 0
The test statistic is calculated to be 4.05, which is greater than the critical value of 2.704 at a significance level of 0.05, indicating strong evidence to reject the null hypothesis and conclude that the mean cost per person exceeds $38.0.
To test if there is sufficient evidence to conclude that the mean cost per person exceeds $38.0, we can perform a one-sample t-test.
Using the given information, the test statistic is calculated as
t = (39.7188 - 38.0) / (3.5476 / √(40)) = 4.05.
Using a t-table with 39 degrees of freedom (n-1), the p-value is found to be less than 0.01.
Since the p-value is less than the significance level of 0.05, we can reject the null hypothesis and conclude that there is sufficient evidence to suggest that the mean cost per person exceeds $38.0.
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A community group is planning on the expansion of a square flower garden in a city park. If each side of the original garden is increased by 9 meters, the new total area of the garden will be 169 square meters. Find the length of each side of the original garden.
A square has its diagonals perpendicular bisector to each other and is of the same length. The length of each side of the original garden is 4 meters.
What is a square?A square has its diagonals perpendicular bisector to each other and is of the same length.
A square is always a rectangle, parallelogram, a rhombus and a quadrilateral but its reverse statement may or may not be true.
Let the length of the original garden be x. Given the garden is in a square shape the area will be the square of the side of the square garden.
Given that each side of the original square garden is increased by 9 meters, therefore, the new total area of the garden will be 169 square meters. Thus, the area of the new garden can be written as,
(x+9)²=169
(x+9)²=13²
x+9=13
x=4
Hence, the length of each side of the original garden is 4 meters.
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The graph represents the distribution of the lengths of play times, in minutes, for songs played by a radio station over one hour.
A graph shows the horizontal axis numbered 2.6 to x. The vertical axis is unnumbered. The graph shows an upward trend from 2.8 to 3.4 then a downward trend from 3.4 to 4.
Which statement is true about the songs played during the one-hour interval?
Most of the songs were between 3 minutes and 3.8 minutes long.
Most of the songs were 3.4 minutes long.
Most of the songs were less than 3.2 minutes long.
Most of the songs were more than 3.6 minutes long.
The correct statement is Most of the songs were between 3 minutes and 3.8 minutes long.
Based on the given information from the graph, we can determine the following:
The graph shows an upward trend from 2.8 to 3.4 on the horizontal axis.
Then, there is a downward trend from 3.4 to 4 on the horizontal axis.
From this, we can conclude that most of the songs played during the one-hour interval were between 3 minutes and 3.8 minutes long. This is because the upward trend indicates an increase in length from 2.8 to 3.4, and the subsequent downward trend suggests a decrease in length from 3.4 to 4.
Therefore, the correct statement is:
Most of the songs were between 3 minutes and 3.8 minutes long.
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Answer:
A
Step-by-step explanation:
At Jefferson High school there are 250 students who drive to school and 375 students who ride the bus to school. The number of students who drive to school is blank% of the number of students who ride the bus to school.
Answer: 40% drive and 60% take the bus.
Step-by-step explanation:
We will divide the number of students who drive to school by the total number of students, and then multiply by 100 to turn it into a percentage.
\(\displaystyle \frac{250}{250+375} *100= 40\%\)
Next, we will divide the number of students who ride the bus to school by the number of students who ride the bus, and then multiply by 100 to turn it into a percentage.
\(\displaystyle \frac{375}{250+375} *100= 60\%\)
(5x-6)(-x+4) using the box method
Answer:
-5x²+26x-24
Step-by-step explanation:
(5x-6)(-x+4)
=5x(-x+4)-6(-x+4)
=-5x²+20x+6x-24
=-5x²+26x-24
Why are most streets designed in a way that they are perpendicular or parallel to each other? ...
The simple reason why streets are usually designed parallel or perpendicular to each other is because that pattern makes it easy for users to connect people easily.
What is meant by perpendicular and parallel streets?A perpendicular street can simply be defined as a street which intersect another streets. However, on the other end, two streets are said to be parallel to each other when they are in the same distance apart. The same is applicable in mathematics as a perpendicular line intercept another line and parallel lines don't meet.
That being said, when streets are parallel or perpendicularly designed, residents of the environment find it easy to communicate with each other. Business owners use this easy accessibility to easily describe their addresses to customers.
So therefore, it can be deduced from the given explanation above that when streets are designed with good planning, it makes people access it easily.
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In a certain tate about 3/5 of regitred voter particated in 2016 election what fraction of regitred voter did not
The fraction of registered voter that did not participate was 2/5
What is a fraction?Is a number that expresses the portion of some number over a total. The number that expresses the portion is known as the numerator and the number that expresses the total is known as the denominator.
To solve this exercise we have to perform a mathematical operation with fractions:
Information about the problem:
Total = 1Registered voter participated= 3/5No. did not participate = ?Calculating the fraction of the registered voter that did not vote we get:
No. did not participate = Total - Registered voter participated
No. did not participate = 1 - 3/5
No. did not participate = (5 - 3) /5
No. did not participate = 2/5
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1)
Using a scale of 1:50000 how many cm on a
map would represent 0.5 km?
Can someone help me with this it would really mean a lot to me
Answer:
Below
Step-by-step explanation:
1:50000 means 1 cm on the map is 50 000 cm in the real world
so 1 cm on the map = 500 m in the real world (100cm = 1m)
500 m IS .5 km
so 1 cm on the map = .5 km
Answer: 1 cm
Step-by-step explanation: convert 50000 cm into km. This will give you 0.5 km. This means that 1 cm represents 0.5km
The tap can fill up the bathtub in 22 minutes. The capacity of the bathtub is 176 L
How much water is added to the tub per minute?
Answer:
8.8 L
Step-by-step explanation:
volume/time
176/22
=8.8
find the mean absolute deviation
Follow these procedures to calculate the mean absolute deviation.
1. Determine the data's mean by adding all of the values and dividing by the number of values in the data set.
2. Subtract the mean from each of the data points.
3. Make each difference a good one.
4. Add up all of the positive differences.
5. Subtract this total from the amount of data values in the collection.
This is the mean absolute deviation.
What is mean absolute deviation?A data set's average absolute deviation is the sum of its absolute departures from a central point. It is a statistical dispersion or variability summary statistic.
The average distance between the values in a data collection and the set's mean is described by mean absolute deviation. A data collection with a mean average deviation of 3.2, for example, has values that are 3.2 units away from the mean on average.
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Need help please as soon as possible
Answer:
Step-by-step explanation:
13x-6y=10 (1,4)
x=1 y=4
⇒ 13*1-6*4=10
⇒ 13-24=10
⇒ -11≠10
⇒ (1,4) isn`t solution of the equation y=13x-6y
y=-3|x-5|+1 (1,-11)
x=1 y=-11
-11=-3|1-5|+1
-11=-3|-4|+1
-11=-3(4)+1
-11=-12+1
-11≡-11
⇒ (1,-11) is solution of the equation y=-3|x-5|+1
CUBE can be applied to all aggregate functions including AVG, SUM, MIN, MAX, and COUNT. True or False?
The given statement "CUBE can be applied to all aggregate functions including AVG, SUM, MIN, MAX, and COUNT." is True because cube is sql function that can be use in any aggregate functions.
The CUBE operator is a SQL feature that can be used to generate summary information from a query by grouping on one or more columns. It can be applied to all aggregate functions including AVG, SUM, MIN, MAX, and COUNT.
When the CUBE operator is used in a query, it generates a set of subtotals and grand totals for all possible combinations of the grouped columns. For example, if we group by two columns, the CUBE operator will generate subtotals for each of the two columns, as well as a grand total for both columns combined.
By using the CUBE operator with aggregate functions, we can easily generate summary information that provides a more comprehensive view of the data. This can be particularly useful in data analysis and reporting, where we often want to see both detailed and summarized information at the same time.
Overall, the CUBE operator is a powerful SQL feature that enables us to generate summary information for all aggregate functions, providing more insights and a better understanding of the data.
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Inverse of this in (x-A)^c
—-
( B )
The inverse of (x-A)^c = B, where A = 2x + 1, is x = -(B^(1/c) + 1).
To find the inverse of the expression in (x - A)^c = B, where A = 2x + 1, we can use the following steps:
First, solve for x in terms of A
x = (A - 1) / 2
Substitute the expression for A into the original equation
(x - (2x + 1))^c = B
Simplify
(-x - 1)^c = B
Take the c-th root of both sides
-x - 1 = B^(1/c)
Solve for x
x = -(B^(1/c) + 1)
Therefore, the inverse of the expression in (x - A)^c = B, where A = 2x + 1, is given by
x = -(B^(1/c) + 1)
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--The given question is incomplete, the complete question is given
" Inverse of this in (x-A)^c = (B)
—-
where A = 2X+1 "--
Find the lowest common multiple (LCM) of 18 and 21.
LMC (18,21) = 126
ok done. Thank to me :>
Is 1 x7 positive or negative
Not sure if I quite understand your question. But ill assume that you're asking if 1 times 7 is positive. Or if 1x7 is positive.
1 times 7 equals 7 so it is a positive integer.
1x7 can be positive or negative depending on what x equals. If x is a negative number then the whole expression is negative. If x is postive the expression is positive.
Which term describes body weight that is more than 20 percent higher than the average weight for a person of a given age and height
Answer:
Obesity describes body weight that is more than 20 percent higher than the average weight for a person of a given age and height. It is a medical condition that is characterized by excessive body fat which poses various health risks including diabetes, heart disease, sleep apnea, and high blood pressure. Obesity may result from a variety of factors such as a sedentary lifestyle, poor dietary habits, genetics, hormonal imbalances, and certain medications. Treatment options for obesity include lifestyle changes, pharmaceutical interventions, and in severe cases, surgical procedures.
A frustum of a pyramid is 16 cm Square at the bottom, 6Cm Square at the top and 12cm high. Find the volume of the frustum.
\(\large\bf{\underline{Given:}}\)
\(\bf{B_{1}=16 cm}\)\(\bf{B_{2}=6 cm}\)\(\bf{H = 12cm}\)__________________________________________
\(\large\bf{\underline{Using\: formula:}}\)
\(\boxed{\bf\underline\pink{⟹\frac{h}{3} \times (b_1 + b_{2} + \sqrt{b_{1} } \times b_{2})}}\)
__________________________________________
\(\large\bf{\underline{Therefore}}\)
\( \bf \: ⟹v = \frac{12}{3} \times (16 + 6 + \sqrt{16 \times 6)} \)
\( \bf \: ⟹v = 4 \times (16 + 6 + 9.7979)\)
\( \bf \: ⟹v = 4 \times 31.7979\)
\( \bf \: ⟹v = 127.1917\)
__________________________________________
\(\large\bf{\underline{Hence}}\)
\(\large\bf{⟹Volume=127.19{cm}^{2}(approx)}\)
Professor Malone is grading papers in the teachers' lounge. She has already finished grading 20 assignments, and is grading 5 more assignments per hour. Her teaching assistant just came in to help her. He can grade at a rate of 7 assignments every hour. At some point, they will be finished and will have graded the same number of papers. How many assignments will they each have graded?
Write a system of equations, graph them, and type the solution.
Answer:
55
Step-by-step explanation:
bedcause if you add 50 and 5 then it makes yes
The number of papers checked by both becomes equal in 10 hours.
What is the solution to the equation?The allocation of weights to the important variables that produce the calculation's optimum is referred to as a direct consequence.
Teacher Malone is reviewing papers in the educators' parlor. She has previously gotten done with reviewing 20 tasks and is evaluating 5 additional tasks each hour. Her showing colleague just came in to help her. He can grade at a pace of 7 tasks consistently.
Let 'x' be the number of hours and 'y' be the number of assignments. Then the equations are given as,
y = 5x + 20 ...1
y = 7x ...2
At some point, they will be finished and will have graded the same number of papers. Then from equations 1 and 2, we have
7x = 5x + 20
7x - 5x = 20
2x = 20
x = 20 / 2
x = 10
The number of papers checked by both becomes equal in 10 hours.
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Find the missing number in this proportion.
30/90 = ?/18
Answer:
1/3 = ?/18
1/3 * 18 = ?
6 = ?
...
Answer:
Step-by-step explanation:
We can use the cross-multiplication method to solve this proportion.
Cross-multiplication means we multiply the numerator of one ratio by the denominator of the other ratio, and then set them equal to each other. Like this:
30 × 18 = 90 × ?
Now we can solve for the missing number by dividing both sides by 90:
30 × 18 / 90 = ?
Simplifying the left side, we get:
6 = ?
So the missing number in the proportion is 6. Therefore:
30/90 = 6/18
Help need it asap plessss
Answer:
C) $14.2
Step-by-step explanation:
$3 is flat value. minimum price. $0.8 per mile for 14 miles is 0.8x14 which equals to 11.2. Add $3 and get $14.2.
C) 14.20
.8×14=11.2
11.2+3=14.2
50 POINTS ANSWER FOR BRAINLIST AND HEARTS
The following are the answer to each statement;
The book is $18 - TrueGiselle can earn up to $18 pulling weeds for her grandma - FalseGiselle's grandma pays her $1 for every 5 weeds she pulls - TrueGiselle does not have to use any of her own money towards the purchase of the book when she pulls 90 weeds - TrueGiselle only needs to pull 18 weeds to not use any of her own money - FalseHow to interpret graph?1. The book is $18
The statement is true because the beginning of the graph represents cost before she picks any weeds.2. Giselle can earn up to $18 pulling weeds for her grandma.
This is not true because the graph shows that she is still able to earn more money from picking weeds.3. Giselle's grandma pays her $1 for every 5 weeds she pulls
This is true because the price change from $18 to $17 is $1 for 0 weeds to 5 weeds.4. Giselle does not have to use any of her own money towards the purchase of the book when she pulls 90 weeds.
This is true because the amount earned for 90 weeds is equivalent to the money needed to buy the book.5. Giselle only needs to pull 18 weeds to not use any of her own money
Giselle will need to pull 90 weeds in order to not spend her own money. The statement is false.Read more on graph:
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What is the solution to the system of equations in the graph?A. (5.5, 0)B. (2, 0)C. (5, -2)D. (-2, 5)
The solution is where both lines cross each other:
Correct option: C (5,-2)
If f(x)=2 sin 3x+C, then the maximum value of f(x) is:
1)C
2) C+2
3) C+3
4) C+6
Reason:
The largest sin(x) can get is 1, and the same goes for sin(3x).
Consequently, the largest 2sin(3x) can get is 2.
You can visually verify these claims by graphing each function with a tool like Desmos. Take note of the y coordinate of the highest points. See below.
Therefore, the largest f(x) = 2sin(3x)+C can get is 2+C or C+2
four equal charges, q, are placed at the corners of a square of side l. the potential at the center of the square is:
The potential at the center of the square due to the four equal charges is (8k * q) / l.
To find the potential at the center of the square due to the four charges, we can calculate the electric potential at that point due to each charge individually and then sum them up.
Given:
Four equal charges, q, placed at the corners of a square of side length l.
The center of the square is at the center of the coordinate system.
The electric potential, V, at a point due to a point charge q is given by the formula:
V = k * q / r
Where:
k is the electrostatic constant (k = 9 * 10^9 Nm^2/C^2)
q is the magnitude of the charge
r is the distance from the charge to the point
Since the charges are placed at the corners of a square, the distance from each charge to the center of the square is l/2. Thus, the potential at the center due to each charge is:
V = k * q / (l/2) = 2k * q / l
Since all four charges are equal, the total potential at the center of the square is the sum of the potentials due to each charge:
V_total = 2k * q / l + 2k * q / l + 2k * q / l + 2k * q / l
V_total = (8k * q) / l
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The potential at the center of the square is the sum of the potentials due to each charge, which can be calculated using the formula V = k * q / r. Since the charges are placed at the corners of the square of side l, the distance from the center of the square to each charge is sqrt(2) * l/2. Therefore, the potential at the center is (4 * sqrt(2) * k * q) / l.
Explanation:
The potential at the center of the square can be found by considering the contributions from each of the four charges. Since the charges are equal and placed at the corners of the square, the electric field at the center will be zero. Therefore, the potential at the center of the square is simply the sum of the potentials due to each charge.
The potential due to a single charge can be calculated using the formula:
V = k * q / r
where V is the potential, k is the electrostatic constant (approximately 9 x 10^9 Nm^2/C^2), q is the charge, and r is the distance.
Since the charges are placed at the corners of the square of side l, the distance from the center of the square to each charge is sqrt(2) * l/2. Plugging in these values, we get:
V = 4 * (k * q / (sqrt(2) * l/2))
V = (4 * sqrt(2) * k * q) / l
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For a recent paint job, Josh mixed red and white paint to make two different shades of pink. When the job was done, Josh ended up with leftover paint: 5 gallons of dark pink paint (80% red) and 4 gallons of light pink paint (30% red). Josh wants to make a medium pink color (50% red) to paint his daughter's bedroom. He will need 3 gallons to completely cover the walls. How much of each of the leftover paints should Josh mix to achieve his desired color?
? gallons of dark pink paint
? gallons of light pink paint
Josh should mix 1.2 gallons of dark pink paint and 1.8 gallons of light pink paint to achieve the desired medium pink color.
To find out how much of each leftover paint Josh should mix to achieve a medium pink color (50% red), we can set up a system of equations based on the percentages of red in the paints.
Let's assume that Josh needs x gallons of dark pink paint and y gallons of light pink paint to achieve the desired color.
The total amount of paint needed is 3 gallons, so we have the equation:
x + y = 3
The percentage of red in the dark pink paint is 80%, which means 80% of x gallons is red. Similarly, the percentage of red in the light pink paint is 30%, which means 30% of y gallons is red. Since Josh wants a 50% red mixture, we have the equation:
(80/100)x + (30/100)y = (50/100)(x + y)
Simplifying this equation, we get:
0.8x + 0.3y = 0.5(x + y)
Now, we can solve this system of equations to find the values of x and y.
Let's multiply both sides of the first equation by 0.3 to eliminate decimals:
0.3x + 0.3y = 0.3(3)
0.3x + 0.3y = 0.9
Now we can subtract the second equation from this equation:
(0.3x + 0.3y) - (0.8x + 0.3y) = 0.9 - 0.5(x + y)
-0.5x = 0.9 - 0.5x - 0.5y
Simplifying further, we have:
-0.5x = 0.9 - 0.5x - 0.5y
Now, rearrange the equation to isolate y:
0.5x - 0.5y = 0.9 - 0.5x
Next, divide through by -0.5:
x - y = -1.8 + x
Canceling out the x terms, we get:
-y = -1.8
Finally, solve for y:
y = 1.8
Substitute this value of y back into the first equation to solve for x:
x + 1.8 = 3
x = 3 - 1.8
x = 1.2
Therefore, Josh should mix 1.2 gallons of dark pink paint and 1.8 gallons of light pink paint to achieve the desired medium pink color.
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Ivan and Yvonne have some licorice rope. Ivan has 1/4 of a rope and Yvonne has 2/3 of a rope.
If they place their licorice end-to-end, which fraction of a licorice rope do they have
A 3/7
B 11/12
C 1/4
D 1/6
E 3/8
Answer: B
Step-by-step explanation: ¼ + ⅔ = 11/12