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3 years ago

Consider the function f(x)=x^2+2x-15. What are the x-intercepts of the function

Mathematics

1 answer:

Zina [86]3 years ago

8 0

Let f(x)=0, you'll get x=3 and x=-5, those are the x-intercepts of the function.

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The weekly salaries of sociologists in the United States are normally distributed and have a known population standard deviation

Lostsunrise [7]

Answer:

$ME =z_{\alpha/2} \frac{\sigma}{\sqrt{n}}$

The confidence level is 0.98 and the significance is $\alpha=1-0.98 =0.02$ and $\alpha/2 =0.01$ and the critical value using the table is:

$z_{\alpha/2}= 2.326$

And replacing we got:

$ME=2.326 \frac{425}{\sqrt{22}}= 210.760\ approx 210.76$

Step-by-step explanation:

For this case we have the following info given:

$\sigma = 425$ represent the population deviation

$n =22$ the sample size

$\bar X =1520$ represent the sample mean

We want to find the margin of error for the confidence interval for the population mean and we know that is given by:

$ME =z_{\alpha/2} \frac{\sigma}{\sqrt{n}}$

The confidence level is 0.98 and the significance is $\alpha=1-0.98 =0.02$ and $\alpha/2 =0.01$ and the critical value using the table is:

$z_{\alpha/2}= 2.326$

And replacing we got:

$ME=2.326 \frac{425}{\sqrt{22}}= 210.760\ approx 210.76$

3 0

2 years ago

Add (−a3z2+4a2z2−5a2z3) to (−3a2z2+7a2z3). −a3z2 + 4a2z2 − 5a2z3 + − 3a2z2 + 7a2z3 a3z2 + a2z2 + a2z3

e-lub [12.9K]

Answer:

there is no why to add this

Step-by-step explanation:

8 0

2 years ago

If it is about 41 miles around how many square miles does it cover

vodka [1.7K]

Answer:

133,7697

Step-by-step explanation:

$C=2*r*\pi 41 = 2*r*\pi r= 6,5253\\S=r^2*\pi = 133,7697$

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2 years ago

What is $250.14 -25.14

meriva

225

Step-by-step explanation:

Look it up on google.

7 0

3 years ago

Read 2 more answers

Help me plz I need help

Oksi-84 [34.3K]

C. is the correct answer because (x+3)^2 is x^2+6x+9

6 0

3 years ago

Read 2 more answers