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3 years ago

Which statement is true?

1 answer:

8 0

$\dfrac{11}{20}=\dfrac{11\cdot7}{20\cdot7}=\dfrac{77}{140}\\\\\dfrac{4}{7}=\dfrac{4\cdot20}{7\cdot20}=\dfrac{80}{140}\\\\\dfrac{77}{140} < \dfrac{80}{140}\to\dfrac{11}{20} < \dfrac{4}{7}\to\boxed{C.}$

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Meredith picked 4 times as many green peppers as red peppers. If she picked a total of 20 peppers, how many green peppers did sh

Fed [463]

She picked 16 green peppers

6 0

3 years ago

Factor the polynomial by grouping 7x2+16x-15

Alika [10]

16x can be broken down into factors of -105.
21 and -5 come to mind.

7x² + 21x - 5x - 15
7x(x + 3) - 5(x + 3)
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7 0

3 years ago

HELP! Which of the following pairs of functions are inverses of each other?

IrinaK [193]

one way is to solve for the invers of the first function

remembe, to solve, replace f(x) or g(x) with y, switch x and y, solve for y and replace it with f⁻¹(x)

f(x)=x/2+8

y=x/2+8

x=y/2+8

x-8=y/2

2x-16=y

f⁻¹(x)=2x-16

nope, not A

f(x)=3x³+16

y=3x³+16

x=3y³+16

x-16=3y³

(x-16)/3=y³

∛((x-16)/3)=y

f⁻¹(x)=∛((x-16)/3)

nope, not the same

not B

f(x)=18/x-9

y=18/x-9

x=18/y-9

x+9=18/y

y(x+9)=18

y=18/(x+9)

f⁻¹(x)=18/(x+9)

correct, the answer is C

answer is C

8 0

3 years ago

Read 2 more answers

In a sample of 230 teenagers, 202 would like to have smaller class sizes at their school. Find the sample

marishachu [46]

Answer:

The sample proportion is 0.88.

The margin of error is of 0.04.

The interval likely to contain the true population proportion is (0.84,0.92).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.