please help me out here !

Answer:

Step-by-step explanation:

ezzzz

Given:

Expression is

\((3x+4)^2-(x-10)^2\)

To find:

The simplified form of the given expression.

Solution:

We have,

\((3x+4)^2-(x-10)^2\)

Using \((a+b)^2=a^2+2ab+b^2\) and \((a-b)^2=a^2-2ab+b^2\), we get

\(=(3x)^2+2(3x)(4)+(4)^2-[(x)^2-2(x)(10)+(10)^2]\)

\(=9x^2+24x+16-[x^2-20x+100]\)

\(=9x^2+24x+16-x^2+20x-100\)

On combining like term, we get

\(=(9x^2-x^2)+(24x+20x)+(16-100)\)

\(=8x^2+44x+(-84)\)

\(=8x^2+44x-84\)

Therefore, the correct option is c.

Answer:

10

Step-by-step explanation:

add like terms

6x+5x=11x

19-1=18

11x+18=128

subtract 18 from both sides

11x=110

110/11=10

x=10

The correlation coefficient between x and y is -0.8.

To calculate the correlation coefficient between two variables, x and y, we can use the formula:

ρ = Cov(x, y) / (σ(x) * σ(y))

Where:

Cov(x, y) is the covariance between x and y.

σ(x) is the standard deviation of x.

σ(y) is the standard deviation of y.

Given that the sample standard deviation for x is 10 (σ(x) = 10), the sample standard deviation for y is 15 (σ(y) = 15), and the covariance between x and y is -120 (Cov(x, y) = -120), we can substitute these values into the formula to calculate the correlation coefficient:

ρ = (-120) / (10 * 15)

ρ = -120 / 150

ρ = -0.8

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The appropriate test to examine the relationship between the number of steps taken and HR in a group of 1000 athletes depends on the type of data and the research question.

If the number of steps and HR are both measured on a continuous scale and the research question is to examine the strength and direction of the relationship between the two variables, then the appropriate test would be Pearson's correlation coefficient.

If either the number of steps or HR is measured on a continuous scale and the other variable is measured on an ordinal scale, then the appropriate test would be Spearman's correlation coefficient.

However, if the research question is to predict HR based on the number of steps taken, and there are other variables that may influence the relationship, then multiple regression analysis would be the appropriate test.

Chi-Square test is used to examine the association between two categorical variables. It is not appropriate for examining the relationship between a continuous and categorical variable.

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This is an example of random sampling. The statistics student numbers each class of senior English and selects one class at random, which ensures that each class has an equal chance of being chosen. By then interviewing each student in that particular senior English class, the student is including all members of the chosen class in his sample. Therefore, this method is considered random sampling.

What is sampling? Sampling is a method of selecting a part or subset of the population that resembles the whole population in characteristics. Random sampling is also known as probability sampling because every group has an equal probability of getting selected.

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The dependent variable of interest in examining whether the degree of parental involvement differs based on students' grade in school is the degree of parental involvement.

In this scenario, the independent variable is the students' grade in school (i.e., first, second, third, etc.). The dependent variable is the variable that is expected to be influenced by the independent variable. In this case, the dependent variable of interest is the degree of parental involvement.

The degree of parental involvement refers to the level or extent to which parents are engaged in their child's education and school-related activities. It can encompass various aspects, such as attending parent-teacher meetings, volunteering at school, helping with homework, and participating in school events.

By examining whether the degree of parental involvement differs based on students' grade in school, researchers or educators aim to explore any potential patterns or differences in parental involvement as children progress through different grade levels. This investigation can provide insights into how parental involvement may vary across grade levels and inform strategies to enhance parental engagement in education at specific stages of a child's schooling. Thus, the dependent variable of interest is the degree of parental involvement.

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Answer:

19

Step-by-step explanation:

Answer:

- 6 1/2

Step-by-step explanation:

-4 - 2 1/2

Since the signs are the same, we add them together and take the signs

4+2 1/2 = 6 1/2

Take the sign

- 6 1/2

Answer:

(-4) - 2 1/2 = -6.5

Step-by-step explanation:

( −4 ) − 2 1/2 = -13/2

-13/2 = -6 1/2  

Answer:

See below

Step-by-step explanation:

g (h(6))   :

   h (6) =  3 ( 6^2) + 2 = 110

   then g (110) =   sqrt (110)

h (g(5))

    g(5) = sqrt 5

        then h( sqrt5) = 3 ( sqrt5)^2 + 2 = 17

The 0.4 in the yellow cell represents the relative frequency of flights that were on time for Airline A.

Option A is the correct answer.

A Relative frequency is a statistical measure that represents the proportion or percentage of a certain category or value in relation to a given set of data.

It is calculated by dividing the frequency of a particular category by the total number of observations in the data set.

We have,

Looking at the table, we can see that the column for Airline A has a total relative frequency of 0.6, which means that 60% of all flights were operated by Airline A.

However, the question asks specifically about the percentage of flights that were on time for Airline A, which is given as 0.4 or 40% in the table.

Thus,

The 0.4 in the yellow cell represents the relative frequency of flights that were on time for Airline A.

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Answer:

Step-by-step explanation:

I don't know I'm just asking the question

Answer:

2x=50

Step-by-step explanation:

Hi there,

Your question is "twice a number (x) is fifty"

Recall how a number is represented by x.

Twice a number would be represented as 2x.

Therefore, to represent that twice a number is equal to 50, that would result in the expression: \(2x=50\)

If you're looking to solve this equation, it's often best to think about the "reverse" of the current equation.

Notice how 2 is multiplying the x.

To isolate x, divide that side by 2.

However, recall that whatever is done to one side of an equation must also be done to the other side of the equation. Therefore, you will need to divide both sides by 2.

\(2x=50\)

\(\frac{2x}{2} = \frac{50}{2}\)

\(x=25\)

Equation: \(2x=50\)

Solving for x: 25

Hope that helps!

Answer:

the answer that i pick and chose is

Step-by-step explanation:

Answer:

44554

Step-by-step explanation:

The ratio of Mary's share to Katherine's share to Alex's share is 5:4:1, which means Mary pays 5/10 of the bill, Katherine pays 4/10 of the bill, and Alex pays 1/10 of the bill.

To find the ratio, we can write their contribution as a fraction of the total parts and then solve the fractions then they'll have the same denominator.

So, Mary's share is 5/10, Katherine's share is 4/10, and Alex's share is 1/10.

To convert this as a ratio, we write 5:4:1, where each number represents the number of parts each person pays, and the colon separates each person's contribution.

Therefore, the ratio of Mary's share to Katherine's share to Alex's share is 5:4:1

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To prove that G is a group, we need to show that it satisfies the group axioms of closure, associativity, identity, and inverse.

Closure: For any kh and k′h′ in G, their product kh⋅k′h′ is also in G.

Associativity: The product operation in G is associative: (kh⋅k′h′)⋅k″h″ = kh⋅(k′h′⋅k″h″) for any kh, k′h′, and k″h″ in G.

Identity: The element 1K⋅1H serves as the identity element in G.

Inverse: For any kh in G, its inverse is given by k−1⋅h−1.

H is a normal subgroup of G because for any kh in G and any h′ in H, the conjugate k−1⋅hk is also in G.

K is a subgroup of G since it is closed under the product operation and has the identity element.

G = KH = HK, which means that every element in G can be expressed as a product of an element in K and an element in H.

H∩K = ⟨1⟩, meaning the intersection of H and K is the trivial subgroup consisting only of the identity element.

The expression hk represents the conjugate of h by k in G, denoted as k−1⋅hk.

Answer:

Step-by-step explanation:

You can create a vector both by enclosing the elements in square brackets like v=[1 2 3 4 5] or using commas, like v=[1,2,3,4,5]. They mean the very same: a vector (matrix) of 1 row and 5 columns.

Answer:

729m^2

Step-by-step explanation:

Area of rectangle  = length x width

From the question, we know that length = 3^2^2 = 81 ( three squared is 9. Nine squared is 81)

width = 3^2 = 9.

Now for the area: length x width = 81 x 9 = 729m^2.

Please mark brainiest.

Answer:

its 100 so it would literally just be 100 - 21

Step-by-step explanation:

The value of the unknown variable in the ordered pair is 8

From the question, we have the following ordered pairs that can be used in our computation:

(r, 3), (5, 9)

Also, we have

m = 2

The meaning of the above notations are

Ordered pairs (x, y) = (r, 3), (5, 9)

Slope, m = 2

The slope of points is calculated using the following slope equation

Slope, m = (y₂ - y₁)/(x₂ - x₁)

Where

(x, y) = (r, 3), (5, 9) and m = 2

Substitute the known values in the above equation, so, we have the following representation

(9 - 3)/(r - 5) = 2

Evaluate the difference

This gives

6/(r - 5) = 2

Divide both sides by 2

So, we have

3/(r - 5) = 1

Cross multiply

r - 5 = 3

So, we have

r = 3 + 5

Evaluate the sum

r = 8

Hence, the value of r is 8

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Possible question

What is the value of r using the following points and slope

(r, 3), (5, 9), m=2

Approximately 6,570 tons of aluminum need to be recycled each year.

To calculate the number of tons of aluminum that need to be recycled each year, we can follow these steps:

Determine the number of soft drink cans consumed per person per year:

Since each person consumes one can every two days, they consume 365/2 = 182.5 cans per year.

Calculate the total number of cans consumed in the United States per year:

Multiply the number of cans consumed per person per year by the total population:

182.5 cans/year/person * 270 million people = 49,275 million cans/year.

Convert the weight of the cans to tons:

Since each can weighs 1/15 pound, we need to convert it to tons. There are 2000 pounds in a ton, so 1/15 pound is equivalent to (1/15) / 2000 = 0.00013333333333333333 tons.

Calculate the total weight of aluminum cans in tons:

Multiply the total number of cans by the weight of each can in tons:

49,275 million cans/year * 0.00013333333333333333 tons/can = 6,570 tons/year.

Therefore, approximately 6,570 tons of aluminum need to be recycled each year to account for the consumption of soft drink cans in the United States.

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The limit definition of a derivative is a mathematical method used to calculate the instant rate of change of a characteristic at a particular point. it is based at the idea of the limit of a function because the input techniques a certain cost.

The limit definition of a derivative is expressed as follows:

\(f'(x) = lim (h → 0) [f(x + h) - f(x)] /h\)

Wherein f'(x) represents the derivative of the function f(x) at a particular factor x. The expression \(( f(x + h) - f(x)) / h\) represents the common price of alternate of the characteristic over a small interval of size h, focused at x. The limit of this expression as h approaches 0 represents the instant fee of change of the characteristic at x, or the slope of the tangent line to the function at that factor.

The limit definition of a derivative is a fundamental concept in calculus and is used to calculate the slopes of tangent lines, to find maximum and minimum factors, and to clear up optimization issues in a huge variety of packages.

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Approximately 68% of the population falls within one standard deviation of the mean in a normal distribution. Therefore, we can expect that around 68% of the sample of 1000 people would have IQs between 95 and 125.

To calculate the number of people outside this range, we can subtract the percentage within the range from 100%. This leaves us with approximately 32% of the sample outside the range of 95 and 125.

Now, to find the approximate number of people, we multiply 32% by the sample size of 1000:

0.32 * 1000 ≈ 320.

Thus, approximately 320 people would have IQs outside the range of 95 and 125.

The closest option among the given choices is 680, which indicates a discrepancy between the calculated result and the options provided. It seems that none of the given options accurately represents the approximate number of people with IQs outside the range.

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Answer:

wait on second thought -8

Step-by-step explanation:

Answer:

-8

Step-by-step explanation:

-11<-3

-3-8 = -11

Difference = -8

The value of \(b=6\)

It is given that \(a\) varies directly to \(b\)

So, we can write \(a=kb\)  (\(k\) = constant)

We know that \(a=7\) when \(b=2\)

that is \(7= 2k\)

          \(k=\frac{7}{2}\)

so when \(a=21\)

                    \(a=kb\)

substitute the value of \(a\) and \(k\)

 that is     \(21=\frac{7}{2} b\)

                    \(b=6\)

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Answer:

very likely

Step-by-step explanation:

False. Athlon and A-Series processors manufactured by AMD are x86 compatible, meaning they can execute software and instructions designed for the x86 architecture.

Contrary to the statement, Athlon and A-Series processors manufactured by AMD are indeed x86 compatible. The x86 architecture, developed by Intel, has become the industry standard for personal computers and servers.

AMD, as one of the leading competitors in the processor market, has designed their processors to be fully compatible with the x86 instruction set.

The x86 architecture is characterized by its ability to handle complex and diverse tasks, providing compatibility with a wide range of software and operating systems.

Athlon and A-Series processors, being part of the x86 family, can seamlessly run software applications written for the x86 architecture without any compatibility issues.

This compatibility is essential for ensuring a smooth user experience and allowing users to leverage a vast ecosystem of software and tools that are built for the x86 platform.

AMD has made significant contributions to the advancement of x86 processors, introducing various architectural enhancements and optimizations.

These processors feature multiple cores, advanced cache systems, and support for high-performance computing tasks. They are widely used in desktop computers, laptops, and servers, catering to the needs of both consumers.

These processors are specifically designed to be fully compatible with the x86 architecture, ensuring efficient execution of software and providing users with access to a wide range of applications and tools.

The x86 compatibility of AMD processors is a significant factor contributing to their popularity and widespread use in the computing industry.

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