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3 years ago

9. If y = 30 when x = 7, find x when y = 12.

Mathematics

1 answer:

Marianna [84]3 years ago

6 0

I have my work at the bottom but to explain you have to divide 30/12, and I got 2.5. That means 30 is 2.5 times bigger than 12. Because we have to find x, we have to divide 7/2.5, to find what is 2.5 times smaller than 7. That’s 2.8. So, x= 2.8

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Bas_tet [7]

Answer: $(4.0845,\ 6.5755)$

Step-by-step explanation:

As per given , we have

n = 11

$\overline{x}=5.33\\\\ s=1.33$

Since population standard deviation is missing, so we use t-test.

Critical t-value for 99% confidence :

$t_{\alpha/2,\ n-1}=3.106$ [using two-tailed t-value table]

Confidence interval :

$\overline{x}\pm t_{\alpha/2}\dfrac{s}{\sqrt{n}}\\\\= 5.33\pm (3.1060)\dfrac{1.33}{\sqrt{11}}\\\\\approx5.33\pm1.2455\\\\=(5.33-1.2455,\ 5.33+1.2455)\\\\=(4.0845,\ 6.5755)$

Hence, 99% confidence interval for the mean amount of time that students spend in the shower each day.= $(4.0845,\ 6.5755)$

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3 years ago

3.(4+5) is how much more than 3.4+5?

kifflom [539]

Answer:10 more

Step-by-step explanation:

distributive property so 3*4+3*5 so 12 an 15 or 27. 3*4+5 is 12+5 so 17 27-17 is 10

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3 years ago

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3) Given that lines a and b are parallel, and lines o and t are parallel, find the point

Crazy boy [7]

Answer:

X = 3°

Step-by-step explanation:

Since O and T are parallel you can use alternating lines

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7x - 5x = 11° - 5°

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This is assuming 11 is an angle

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2 years ago

3(y - 3) = -15<br> I really need help

Tomtit [17]

Answer:

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Step-by-step explanation:

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3 years ago

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Find the measure of the missing value in the

kumpel [21]

Answer:

12.6

Step-by-step explanation:

The two left sides have lengths, so this allows you to establish the ratio of the lengths of the sides of the triangles,

left triangle : right triangle

ratio = 25 : 17.5

The bottom sides are also in the same ratio.

ratio = 18 : w

Write a proportion by setting the ratios equal and solve for w.

25/17.5 = 18/w

Cross multiply.

25w = 17.5 * 18

25w = 315

w = 12.6

Answer: 12.6

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3 years ago

9. If y = 30 when x = 7, find x when y = 12.​

9. If y = 30 when x = 7, find x when y = 12.