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4 years ago

these lines shown below are parallel. if the green line has a slope of -2, what is the slope of the red line?

Mathematics

1 answer:

Wittaler [7]4 years ago

5 0

I think it should be +2

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In a recent study of 42 eighth graders, the mean number of hours per week that they watched television was 19.6. Assume the popu

olya-2409 [2.1K]

Answer:

$19.6-2.42\frac{5.8}{\sqrt{42}}=17.43$

$19.6+2.42\frac{5.8}{\sqrt{42}}=21.77$

And the best option for this case would be:

a. (17.5, 21.7)

Step-by-step explanation:

Information given

$\bar X= 19.6$ represent the sample mean

$\mu$ population mean

$\sigma= 5.8$ represent the population deviation

n=42 represent the sample size

Confidence interval

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

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

The degrees of freedom, given by:

$df=n-1=42-1=41$

Since the Confidence is 0.98 or 98%, the significance would be $\alpha=0.02$ and $\alpha/2 =0.1$ , and the critical value would be $t_{\alpha/2}=2.42$

Replacing we got:

$19.6-2.42\frac{5.8}{\sqrt{42}}=17.43$

$19.6+2.42\frac{5.8}{\sqrt{42}}=21.77$

And the best option for this case would be:

a. (17.5, 21.7)

8 0

3 years ago

What is the value of x in the equation 5(3x + 4) = 23?

Dvinal [7]

Answer:

x = 1/5

Step-by-step explanation:

5(3x + 4) = 23

Distribute

15x+20 = 23

Subtract 20 from each side

15x+20-20 = 23-20

15x = 3

Divide by 15

15x/15 = 3/15

x = 1/5

3 0

3 years ago

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A cylinder has a volume of 175 cubic units and a height of 7 units. The diameter of the cylinder is

olga nikolaevna [1]

Easy the answer is... about 5

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3 years ago

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Evalue 3a -4b for a =a and b=6

katrin2010 [14]

Answer:

3a-4b

3a-4(6)

3a-24

Step-by-step explanation:

8 0

3 years ago

The area of the red triangle is------ cm.

mr_godi [17]

Haudicjduyshsvdbcbis 2cn and yes it is

6 0

3 years ago

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