Select all of the following that represent direct variation.
1. y = 5x
2. y = 2x + 1
3. 3 = xy
4. b = 1/2a
5. y= 2/x
6. m = 5n

The margin of error, a statistic, is a measure of how much random sampling error there is in survey data.

The margin of error exists 0.07728.

A statistic known as the margin of error describes how much random sampling error there is in survey data. Less faith should be placed in a poll's results representing the outcome of a population census as the margin of error increases.

A survey's margin of error, also known as the confidence interval, is a measurement of error in the data, particularly when the sampling method of a survey is used. This indicator lets researchers know to what extent survey findings should be taken as representative of the entire community under study.

Given : n = 36

x-bar = 3222.2 g

s = 686.7

Confidence level 95%

The 2 - critical Valve = 2.03

A) Let the equation be

[tex]$S F=\sqrt{\frac{\bar{x}(1-\bar{n})}{n}}$$[/tex]

substitute the values in the above equation, we get

[tex]$& \Rightarrow \sqrt{\frac{(3222.2)(1-3222.2)}{100}} \\[/tex]

SE = 0.03807

B) Margin of error = (0.03807)(2 ×[tex]I_2[/tex] )

Margin of error = 0.07728

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Answer:

1000

Step-by-step explanation:

The recursive formula for the sequence f(1)=1, f(2)=9, f(3)=17, f(4)=25, f(5)=33 is aₙ₋ =aₙ₋₁ +d

We should know that a recursive sequence is a sequence in which the terms are gotten using one or more previous terms along with an initial condition.

The given sequence is f(1)=1, f(2)=9, f(3)=17, f(4)=25, f(5)=33

This forms an Arithmetic Progression (AP)

The terms are 1, 9, 17, 25, 33, ...

The common different is 9-1 = 8

The terms are

a₁, a₂+d, a₃+d, a₄+d, + .....+ aₙ+(n-1)d

Therefore the The recursive formula for the sequence f(1)=1, f(2)=9, f(3)=17, f(4)=25, f(5)=33 is aₙ₋ =aₙ₋₁ +d

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Answer:

4

Step-by-step explanation:

it's the best because of my friend its the greatest factor

The new mean for the given data would be 80.

What is the mean of the numbers?

The average (mean) is equal to the sum of all the data values divided by the number of values in the data set.

Mean = Sum / Count

Firstly 18 students took the test and the mean was 81.

By using the definition of mean we can write

        Mean = sum of scores/number of students

         81 = sum of scores / 18

    Sum of scores = 81 * 18

                             = 1458

Now later the four absent kids made it up and scored 77, 85, 68, and 80.

Now new sum of the scores would be = 1458 + 77 +  85 + 68 + 80

                                                               = 1768

And the total number of students will be = 18 + 4 = 22

New mean = new score/number of students

                  = 1768/22

                   = 80.36

                   ≈ 80

Hence, the new mean for the given data would be 80.

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We will not be able to figure out the price of one can of each type of canned food in the same manner of operating on two equations.

This is because the equation are identical.

Let the dog food be represented by d.

Let the cat food be represented by c.

Since Carlos buys 4 cans of dog food and 6 cans of cat food for $12.00. This will be:

4d + 6c = 12

This cane b reduced to lowest term as 2d + 3c = 6

Then the next week, he purchased 2 cans of dog food and 3 cans of cat food for $6.00. This will be:

2d + 3c = 6

Since the equations are the same, we can't calculate the price.

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Answer: 104%

Step-by-step explanation:

75/78=1.04

The biweekly pay is $1,385, the hourly rate of pay for 160 hours of work per month is $17.31, and the overtime rate of pay is $25.96.

It is given that, the annual pay is $36,010.

There are 52 weeks in a year. So, there are 26 biweeks in a year.

Then, the biweekly pay = (Annual pay)/the number of biweeks in a year

⇒ biweekly pay = (36,010)/26 = $1,385

There are 160 working hours in a month.

So, biweekly working hours = 160/2 = 80 (for two weeks in a month)

Then, the hourly rate of pay is calculated by

hourly rate of pay = biweekly pay/biweekly working hours

⇒ hourly rate of pay = 1,385/80 = $17.31

To calculate the overtime rate of pay, we need to know the number of overtime working hours and the multiplier.

Here we are finding the overtime rate per hour. So, we can find the overtime rate of pay by

overtime rate of pay = hourly rate of pay × multiplier

We have the overtime multiplier per hour as 1.5.

Then,

Overtime rate of pay = 17.31 × 1.5 = $25.96

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3-year treasury securities as calculated from the data will now have a rate of 3.70%.

Current interest rate is calculated as Current Interest Rate + Liquidity Premium.

Average interest for 3 Year = (3.45% + 3.95% +3.25%)/3   = 3.55

3 year security liquidity premium = 0.15%

3 year Treasury security's current rate is 3.55% +0.15%.

= 3.70%

Therefore, The current rate be on 3-year treasury securities is 3.70%.

Interest is the fee paid for having access to borrowed funds. While the interest rate used to compute interest is often reported as an annual percentage rate, interest expense or revenue is sometimes expressed as a dollar figure (APR).

The compensation a lender or financial organisation receives for giving out money is called interest. The percentage of a stockholder's ownership in a corporation that is also referred to as interest.

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Answer: -9

Step-by-step explanation: If you subtitutie -2 in for x, ask yourself , what is 4*-2 which is -8 which is then subtracted by 1 which gets you -9 so, this means f (-2)=-9

Hope this helped!

The solution of the equation 2.5x² − 1.95x − 225.6 = 0 will be negative 9.117 and 9.897.

The allocation of weights to the important variables that produce the calculation's optimum is referred to as a direct consequence.

The equation is given below.

2.5x² − 1.95x = 225.6

Simplify the equation, then we have

2.5x² − 1.95x = 225.6

2.5x² − 1.95x − 225.6 = 0

Then the solution of the equation is given as,

[tex]\rm x = \dfrac{-(-1.95) \pm \sqrt{(-1.95)^2 - 4 \times 2.5 \times (-225.6)}}{2 \times 2.5}[/tex]

Simplify the expression, then we have

x = [1.95 ± 47.537] / 5

x = (1.95 + 47.537) / 5, (1.95 - 47.537) / 5

x = 9.897, -9.117

The solution of the equation 2.5x² − 1.95x − 225.6 = 0 will be negative 9.117 and 9.897.

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The total number of pairs sold by SoccerWorld is 57

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

The above parameters means that

s = 3j

d = 5 + j

70(s + d + j) = 7000

Where

j = JP Sports

s = SoccerWorld

d = DirectSportz

Divide both sides of 70(s + d + j) = 7000 by 70

s + d + j = 100

Substitute s = 3j and d = 5 + j

3j + 5 + j + j = 100

Evaluate the like terms

5j = 95

Divide by 5

j = 19

Substitute j = 19 in s = 3j

s = 3 * 19

So, we have

s = 57

Hence, the number of pairs is 57

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The value of matrix multiplication is

a)    [tex]C = \begin{pmatrix}14&20\\ 32&46\end{pmatrix}[/tex]

b)  [tex]C = \begin{pmatrix}7&35\\ 8&42\end{pmatrix}[/tex]

c)  [tex]C = \begin{pmatrix}22&32\\ 26&38\end{pmatrix}[/tex]

d)  [tex]C =\begin{pmatrix}-3&-5\\ 34&52\end{pmatrix}[/tex]

What is multiplication of matrices?

The product of two matrices A and B is defined if the number of columns of A is equal to the number of rows of B. The first matrix must have the same number of columns as the second matrix has rows. The number of rows of the resulting matrix equals the number of rows of the first matrix, and the number of columns of the resulting matrix equals the number of columns of the second matrix

Given data ,

a)

Let the first be A

[tex]A = \left[\begin{array}{ccc}1 &2 \\ 3 & 4 \\\end{array}\right][/tex]

Let the second matrix be B

[tex]B = \left[\begin{array}{ccc}4 &6 \\ 5 & 7 \\\end{array}\right][/tex]

Now , the product of matrices A and B is C

where the matrix C is A x B

[tex]C = \begin{pmatrix}1\cdot \:4+2\cdot \:5&1\cdot \:6+2\cdot \:7\\ 3\cdot \:4+4\cdot \:5&3\cdot \:6+4\cdot \:7\end{pmatrix}[/tex]

On simplifying the matrix C , we get

[tex]C = \begin{pmatrix}14&20\\ 32&46\end{pmatrix}[/tex]

Therefore , the value of matrix is  [tex]C = \begin{pmatrix}14&20\\ 32&46\end{pmatrix}[/tex]

b)

Let the first matrix be A

[tex]A = \left[\begin{array}{ccc}3 &5 \\ 4 & 6 \\\end{array}\right][/tex]

Let the second matrix be B

[tex]B = \left[\begin{array}{ccc}-1 &0 \\ 2 & 7 \\\end{array}\right][/tex]

Now , the product of matrices A and B is C

where the matrix C is A x B

[tex]C = \begin{pmatrix}3\left(-1\right)+5\cdot \:2&3\cdot \:0+5\cdot \:7\\ 4\left(-1\right)+6\cdot \:2&4\cdot \:0+6\cdot \:7\end{pmatrix}[/tex]

On simplifying the matrix C , we get

[tex]C = \begin{pmatrix}7&35\\ 8&42\end{pmatrix}[/tex]

Therefore , the value of matrix is [tex]C = \begin{pmatrix}7&35\\ 8&42\end{pmatrix}[/tex]

c)

Let the first matrix be A

[tex]A = \left[\begin{array}{ccc}4 &6 \\ 5 & 7 \\\end{array}\right][/tex]

Let the second matrix be B

[tex]B = \left[\begin{array}{ccc}1 &2 \\ 3 & 4 \\\end{array}\right][/tex]

Now , the product of matrices A and B is C

where the matrix C is A x B

[tex]C = \begin{pmatrix}4\cdot \:1+6\cdot \:3&4\cdot \:2+6\cdot \:4\\ 5\cdot \:1+7\cdot \:3&5\cdot \:2+7\cdot \:4\end{pmatrix}[/tex]

On simplifying the matrix C , we get

[tex]C = \begin{pmatrix}22&32\\ 26&38\end{pmatrix}[/tex]

Therefore , the value of matrix is  [tex]C = \begin{pmatrix}22&32\\ 26&38\end{pmatrix}[/tex]

d)

Let the first matrix be A

[tex]A = \left[\begin{array}{ccc}-1 &0 \\ 2 & 7 \\\end{array}\right][/tex]

Let the second matrix be B

[tex]B = \left[\begin{array}{ccc}3 &5 \\ 4 & 6 \\\end{array}\right][/tex]

Now , the product of matrices A and B is C

where the matrix C is A x B

[tex]C = \begin{pmatrix}\left(-1\right)\cdot \:3+0\cdot \:4&\left(-1\right)\cdot \:5+0\cdot \:6\\ 2\cdot \:3+7\cdot \:4&2\cdot \:5+7\cdot \:6\end{pmatrix}[/tex]

On simplifying the matrix C , we get

[tex]C =\begin{pmatrix}-3&-5\\ 34&52\end{pmatrix}[/tex]

Therefore , the value of matrix is  [tex]C =\begin{pmatrix}-3&-5\\ 34&52\end{pmatrix}[/tex]

Hence , the matrix multiplication is solved and the results are given

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Answer:

x = 1/3

Step-by-step explanation:

12=7+15x

12-7=15x

5=15x

5/15=x

Simplify

x = 1/3

Answer:x=1/3 or x=0.3 I hope this helpful mark me brainlist if correct

Step-by-step explanation:

12=7+15x

Move the variable to the left-hand side and change its sign

12-15x=7

Then move the constant to the right-hand side and change its sign

-15x=7-12

Calculate the difference
-15x=-5

Divide both sides of the equation by -15

x=1/3 or x=0.3

Answer:

y= x +4

Step-by-step explanation:

2 point form : y -20 = x- 16

slope intercept form: y = x + 4

The values of a, h and k for the  given quadratic function are:

a = -6, h = -5 and k = -1

What is vertex form?

This is one way of writing a quadratic function:

f(x) = a(x-h)² +k

(h, k) = vertex

a = vertical stretch

According to the given question:

We're given:

f(x)= -6x² - 60x - 151

To write a quadratic function in vertex form, we must complete the square.

⇒ Put parentheses around the first two terms containing x and x²:

f(x)= (-6x² - 60x) - 151

⇒ Factor out -6 (keeping the x's in the parentheses):

f(x)= -6(x² + 10x) - 151

⇒ To complete the square, add, inside the parentheses, the square of half the coefficient of x.

⇒ In this case, the coefficient of x is 10.

⇒ Half of this value is 5.

⇒ The square of 5 is 25.

⇒ Add this inside the parentheses:

f(x) =  -6(x² + 10x + 25) - 151

⇒ Now, we cannot randomly introduce a new value into a function. To balance the +25, subtract -6(25) outside the parentheses:

f(x) =  -6(x² + 10x + 25) - 151 - (-6 x 25)

f(x) =  -6(x² + 10x + 25) - 151 - (-150)

f(x) =  -6(x² + 10x + 25) - 151 + 150

f(x) =  -6(x² + 10x + 25) - 1

⇒ Finally, complete the square.

Remember: (a + b)² = a² + 2ab + b²

In this case, a is x, and b is 5:

f(x) = -6(x + 5)² - 1

On comparing with f(x) = a(x-h)² +k we get the values of a, h and k as:

a = -6

h = -5

k = -1

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The distance between UFO and KA-12 is 1229.7 Km

Given,

Satellites KA-12 and SAL-11 have spotted a UFO.

Distance between Satellites KA-12 and SAL-11 = 900 km

Angle between UFO and SAL-11 = 60°

Angle between UFO and KA-12 = 75°

We have to find the distance between UFO and KA-12;

Here,

Consider as a triangle;

Sum of interior angles of a triangle = 180 degree

So,

The third angle here will be = 180 - 60 + 75 = 180 - 135 = 45°

Now, use sin rule;

x / sin 75 = 900 / sin 45

x = sin 75 × 900 / sin 45

x = 900 × 0.966 / 0.707

x = 869.4 / 0.707

x = 1229.7

That is,

UFO is 1229.7 Km far from KA-12

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Answer: angle EHF = 31 degrees

Step-by-step explanation:

Complementary angles mean either of two angles whose sum is 90°.

So the equation is 6x-1+3x+1=90

combine like terms

9x=90

x=10

Substitute in 10 to EHF or 3x+1

3(10)+1

angle EHF = 31

By ASA property

Therefore, if all three sides of two triangles are the same, then the triangles are said to be congruent. If we have a side, an angle between the sides, and then another side that is congruent, we know they are congruent. In other words, side, angle, side.

We are asked that will property will show that Δ NKL ≅Δ LMN

It is given that NL  bisect KNM and KLM

∠ KNL≅ ∠ MNL (by bisect property)  (angle)

∠ KLN ≅∠MNL (by bisect property)    (angle)

line NL   (common)

Thus by ASA property we can say that Δ NKL ≅ΔLMN

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Answer: five beers' worth of alcohol in a bottle of wine.

Step-by-step explanation:

In order to have an equivalent amount of alcohol as red wine, we would need to consume approximately 6 bottles of beer.

To determine how many bottles of beer need to be consumed in order to have an equivalent amount of alcohol as red wine, we can compare the alcohol content in both beverages.

The red wine has a volume of 750 ml and an alcohol content of 12%. This means that the red wine contains 750 ml x (12/100) = 90 ml of alcohol.

The beer has a volume of 330 ml and an alcohol content of 5%. This means that each bottle of beer contains 330 ml x (5/100) = 16.5 ml of alcohol.

To find the number of beer bottles needed to match the alcohol content of the red wine, we divide the total amount of alcohol in the red wine by the amount of alcohol in one beer bottle:

The number of beer bottles:

90 ml / 16.5 ml = 5.45

Since we can't have a fraction of a beer bottle, we round up to the nearest whole number.

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Answer:

178.7 miles

Step-by-step explanation:

First, determine the miles per gallon:

[tex]\frac{302.9\ miles}{23.3\ gallons}\\13.0\frac{miles}{gallon}[/tex]

Then, use that value to find miles traveled on 13.7 gallons:

[tex]13.7\ gallons(\frac{13\ miles}{1\ gallon})\\178.7\ miles[/tex]

Answer:

2y4−4y3−3y2+8y :)

Answer:

x = -4 ± √2

Step-by-step explanation:

x^2+8x+16=2

(x + 4)^2 = 2

x + 4 = ±√2

x = -4 ± √2

The town with the greater population density is C. Town A, with about 1,027 people per square mile.

Population density is the quotient of the number of individuals (population) living in a specified location divided by the geographic size of the area, usually measured in squared miles.

Towns          Population        Squared Miles        Persons/square mile

Town A         397,546                387                      1,027 (397,546/387)

Town B         264,108                 261                      1,012 (264,108/261)

Thus, we can conclude that Town A has a greater population density than Town B.

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The values would be

sin2x = -3/5

cos2x = -4/5

tan2x = 3/4

What are double angles in trigonometry?

The double angle formulas are used to find the values of double angles of trigonometric functions using their single angle values. For example, the value of cos 30° can be used to find the value of cos 60°. Also, the double-angle formulas can be used to derive the triple-angle formulas.

Given: tanx = -3

Now as we know,

                  [tex]sin2x=\frac{2tanx}{1+tan^2x}\\\\sin2x=\frac{2(-3)}{1+(-3)^2}\\\\sin2x=\frac{-6}{10}\\\\sin2x=\frac{-3}{5}[/tex]

Now

               [tex]cos2x=\frac{1-tan^2x}{1+tan^2x}\\\\cos2x=\frac{1-(-3)^2}{1+(-3)^2}\\\\cos2x=\frac{1-9}{1+9}\\\\cos2x=\frac{-8}{10}\\\\cos2x=\frac{-4}{5}[/tex]

And similarly, we can find the value of tan2x, as

                  tan2x = sin2x/cos2x

                             = (-3/5)/(-4/5)

                             = 3/4

Hence,

The values would be

sin2x = -3/5

cos2x = -4/5

tan2x = 3/4

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The point [tex]B(1,8)[/tex]is not a solution of the given inequality. Whereas the points [tex]C(-5,10) \text { and } D(3,6) \\[/tex]are the solutions of the given inequality.

What is inequality?

The idea of inequality, which is the state of not being equal, especially in terms of status, rights, and opportunities1, is at the core of social justice theories. However, because it frequently has diverse meanings to different people, it is prone to misunderstanding in public discourse.

It can be found out simply by substituting [tex](x, y)[/tex] values in the given equation

[tex]y < 2 x^2+3 x-5[/tex]

let us start with the point [tex]3(1,8)[/tex]

here [tex]x=1 \text { and } y=8[/tex] therefore [tex]y < 2 x^2+3 x-5[/tex]

[tex]8 < 2\left(1^2\right)+3(1)-5=2+3-5=0[/tex]

that means, [tex]8 < 0[/tex] which is an incorrect inequality, therefore the point

[tex]B(1,8)[/tex] is not a solution of the given inequality.

similarly, for [tex]C(-5,10)[/tex]

[tex]10 < 2(-5)^2+3(-5)-5=50+15-5=60[/tex]

that is [tex]10 < 60[/tex], which is correct.

therefore[tex]C(-5,10)[/tex] is a solution of the given inequality.

next[tex]D(3,6)[/tex]

[tex]6 < 2(3)^2+3(3)-5=18+9-5=22[/tex]

that is[tex]6 < 22[/tex], which is correct . Therefore the point D is a solution of the given inequality.

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Answer:

Step-by-step explanation:

Solve by Factoring 2x^2-9x=x^2-20. 2x2−9x=x2−20 2 x 2 - 9 x = x 2 - 20. Step 1. Move all the expressions to the left side of the equation.

:)

Answer:

Step-by-step explanation:

the answer is a

Answer:

The y-intercept is 8.