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3 years ago

Solve: Factor the following polynomial completely -9x^2-30x-25

Mathematics

2 answers:

AnnZ [28]3 years ago

5 0

Answer:-(3x+5)^2

Step-by-step explanation:

Korolek [52]3 years ago

3 0

Answer:

(−3x−5)(3x+5)

Step-by-step explanation:

−9x2−30x−25

=(−3x−5)(3x+5)

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Which is the graph of g(x)?

hichkok12 [17]

Answer:

option d

Step-by-step explanation:

We are given with three function

Plug in x=-2 in first function

f(x)= 3 so f(-2) = 3

Plug in x=-2 in second function

$f(x) = -\frac{x}{2} +2$

$f(-2) = -\frac{-2}{2} +2=3$

Plug in x=2 in second function

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Plug in x=2 in third function

f(x)= 2x-3

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also f(2) = 1 is same for second and third functions

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A researcher wants to estimate the percentage of all adults that have used the Internet to seek pre-purchase information in the

lara31 [8.8K]

Answer:

The sample size is 1875.

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.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

Sampling error of 0.03.

This means that $M = 0.03$

99.74% confidence level

So $\alpha = 0.0026$ , z is the value of Z that has a pvalue of $1 - \frac{0.0026}{2} = 0.9987$ , so $Z = 3$ .

25% of all adults had used the Internet for such a purpose

This means that $\pi = 0.25$

What is the sample size

The sample size is n. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 3\sqrt{\frac{0.25*0.75}{n}}$

$0.03\sqrt{n} = 3\sqrt{0.25*0.75}$

Simplifying by 0.03 both sides

$\sqrt{n} = 100\sqrt{0.25*0.75}$

$(\sqrt{n})^2 = (100\sqrt{0.25*0.75})^2$

$n = 1875$

The sample size is 1875.

7 0

3 years ago