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3 years ago

I dont understand this question. Also if anyone is on geometry byu part two let me know and we can work together !

Mathematics

1 answer:

damaskus [11]3 years ago

4 0

Answer:

Area of circle R = 75π un² or ≈235.5 un²

Step-by-step explanation:

The problem says that m∠TRS = 120º. The total number of degrees in a circle is 360º. 120º is a third of 360º. Therefore, we can prove that the shaded sector is a third of the circle.

The problem then says that the area of the shaded sector is 25π and we have to calculate the area of the entire circle. Since we already know that the shaded sector is a third of the circle, we can simply multiply 25π by 3 in order to calculate the area of t he entire circle.

25π × 3 = 75π.

Area of circle R = 75π un² or ≈235.5 un²

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A school has 3400 students. They conduct a random sample of 124 students and find that 38 of them hate the school.

Contact [7]

Answer:

a) We need a sample size of at least 2401.

b) We need a sample size of at least 1936.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , we have the following confidence interval of proportions.

In which

z is the zscore that has a pvalue of .

The margin of error is:

95% confidence level

So , z is the value of Z that has a pvalue of , so .

(a) you are unwilling to predict the proportion value at your school and

We use , which is when we are going to need the largest sample size.

So we need to find We need a sample size of at least 2401.

(b) you use the results from the surveyed school as a guideline.

Now the same calculation, just with . So

We need a sample size of at least 1936.

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3 years ago

Calculate cos theta to two decimal places

Ghella [55]

Answer:

B. 0.72

Step-by-step explanation:

In order to find the answer we need to use the following formula:

$a^2=b^2+c^2-2bc*cos(\theta)$ where:

a, b, c are the length of the sides and $\theta$ the angle, so:

$7^2=10^2+8^2-(2*10*8)*cos(\theta)$

$49=164-(160)*cos(\theta)$

$cos(\theta)=0.71875$

In conclusion, $cos(\theta)=0.72$ , so the answer is B.

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3 years ago

Find the axis of symmetry: <br> Y=4x^2+16x-2

irinina [24]

Do this by converting to vertex form

y = 4x^2 + 16x - 2

y = 4 (x^2 + 4x - 0.5) completing the square on x^2 + 4x:-

y = 4[(x + 2)^2 - 4.5]

the axis of symmetry is x = -2

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4 years ago

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Answer:

1.5m/s^2

Step-by-step explanation:

acc= change in velocity/time

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acc=1.5

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3 years ago

An airline asked its agents to assign convenience ratings on a scale of 1-7 to 114 flights leaving one of its hub cities. The hi

Viefleur [7K]

17 bc it's in the middle (btw I didn't make that up my teacher in 6th grade said that)

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3 years ago

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