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3 years ago

I need help with this

Mathematics

1 answer:

NeX [460]3 years ago

4 0

Step-by-step explanation:

x+30°=4x(inscribed angle is equal to its arc)

4x-x=30°

3x=30°

x=30/3

x=10°

hope it helps.

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9 of the students in Sarah's grade like to watch football and 12 like to watch figure skating. 7 students like to watch both foo

madreJ [45]

Answer:

Step-by-step explanation:

Total for football: 9 +7

Total for figure skating: 12 +7

NEW Total for football: 16

NEW Total for figure skating: 19

The question says that 9 people like football

The question says that 12 people like to watch figure skating

The question also says that 7 people like to watch both, and because of that, you should add 7 to both 9 and 12, but keep the new numbers separated from each other. So once we know the sum of 9 +7 is 16, and 12 + 7 is 19, we can subtract the two numbers, and get 3 as the answer. Because you are counting the number of times that you have to travel up or down to the other number, and so if you are on a set of stairs that go up to the 16 level and you are on the 14th level, you need to travel up 2 sets of stairs to get to level 16.

Hope that example helps and can help in the future with other problems!

8 0

3 years ago

A manager records the repair cost for 4 randomly selected stereos. A sample mean of $82.64 and standard deviation of $14.32 are

zysi [14]

Answer:

CI = (70.861 , 94.418)

Step-by-step explanation:

In order to determine the 90% confidence interval you use the following formula (for a population approximately normal):

$CI=(\overline{x}-Z_{\alpha/2}\frac{\sigma}{\sqrt{n}},\overline{x}+Z_{\alpha/2}\frac{\sigma}{\sqrt{n}})$ (1)

$\overline{x}$ : mean = 82.64

σ: standard deviation = 14.32

n: sample = 4

α: tail area = 1 - 0.9 = 0.1

Z_α/2 = Z_0.05: Z factor = 1.645

You replace these values and you obtain:

$Z_{0.05}(\frac{14.32}{\sqrt{4}})=(1.645)(\frac{14.32}{\sqrt{4}})=11.778$

The confidence interval will be:

$CI=(82.64-11.778,82.64+11.778)=(70.861,94.418)$

The 90% confidence interval is (70.861 , 94.418)

6 0

3 years ago

Which statement compares the shape of the dot plots?

Alex

Answer: C - Only the fifth-grade data points are distributed fairly evenly.

Step-by-step explanation: Just took the test and that is the right anwser.

6 0

3 years ago

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Which section of the function is decreasing? (4 points) A graph is shown. Segment A is a horizontal line beginning at the y-axis

Artist 52 [7]

Answer: D

Step-by-step explanation:

If segment D moves downward it means its function has a negative slope so the line will be decreasing.

5 0

3 years ago

2+d=2-3(d-5)-2 Pls show work

defon

2 + d = 2 - 3(d- 5) - 2

First, cancel 2 on both sides. / Your problem should look like: $d = -3(d - 5) - 2$
Second, expand. / Your problem should look like: $d = -3d + 15 - 2$
Third, simplify -3d + 15 - 2 to get -3d + 13. / Your problem should look like: $d = -3d + 13$
Fourth, add 3d to both sides. / Your problem should look like: $d + 3d = 13$
Fifth, add d + 3d to get 4d. / Your problem should look like: $4d = 13$
Sixth, divide both sides by 4. / Your problem should look like: $d = \frac{13}{4}$

Answer as fraction: $d = \frac{13}{4}$
Answer as decimal: $d = 3.25$

3 0

3 years ago

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