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3 years ago

Plz give answer ans look at pic

Mathematics

1 answer:

Oliga [24]3 years ago

7 0

Answer:

$-\frac{2}{5}$

Step-by-step explanation:

The average rate of change is defined as $\frac{f(b)-f(a)}{b-a}$

In this case, b=2 and a =-3

Knowing this, we can input in our known values

$\frac{f(2)-f(-3)}{2+3}\\\\\frac{f(2)-f(-3)}{5}$

Now we can find the values of $f(2)$ and $f(-3)$ using the table

This gives us, which can be simplified to

$\frac{0-2}{5}\\\\\\-\frac{2}{5}$

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Simplify:<br> x2 +5x-14<br> x2+10x+21

goblinko [34]

Answer:

4x + 15x + 7

Step-by-step explanation:

x2 + x2 = 4x

5x + 10x = 15x

-14 + 21 = 7

5 0

3 years ago

The radius of circle a is 6 in. the radius of circle b is 5 in. greater than the radius of circle a. the radius of circle c is 5

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2 years ago

Kate prepared 9 kilograms of dough after working 3 hours. How many hours did Kate work if she prepared 12 kilograms of dough? As

beks73 [17]

Answer:

4 hours

Step-by-step explanation:

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3 0

3 years ago

Guys please help me with this question

Kruka [31]

Answer:

if it's gonna equal 12 then a and b equals 6

Step-by-step explanation:

a/b

a=6

b=6

6/6

4 0

3 years ago

Researchers are interested if a school breakfast program leads to taller children. Assume that the population of all 5 year-old

DedPeter [7]

Answer:

$39-1.96\frac{1}{\sqrt{25}}=38.608$

$39+1.96\frac{1}{\sqrt{25}}=39.392$

So on this case the 95% confidence interval would be given by (38.608;39.392)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X=39$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma=1$ represent the population standard deviation

n=25 represent the sample size

Solution to the problem

The confidence interval for the mean is given by the following formula:

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

The margin of error is given by:

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

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a tabel to find the critical value. The excel command would be: "=-NORM.INV(0.025,0,1)".And we see that $z_{\alpha/2}=1.96$

And replacing we got:

$ME= 1.96 *\frac{1}{\sqrt{25}}= 0.392$

Now we have everything in order to replace into formula (1):

$39-1.96\frac{1}{\sqrt{25}}=38.608$

$39+1.96\frac{1}{\sqrt{25}}=39.392$

So on this case the 95% confidence interval would be given by (38.608;39.392)

7 0

3 years ago

Plz give answer ans look at pic​

Plz give answer ans look at pic