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weqwewe [10]
3 years ago
5

What is the area? Plz help fast I will mark brainliest ASAP

Mathematics
2 answers:
Yakvenalex [24]3 years ago
8 0

Probably too late, but still need to know how to do this.

Formula for the area of a circle: A = πr²     [pi times radius(r) squared]

The radius is half of the diameter. [diameter would be a line that would go through the whole circle, the radius would be a line that would stop/end halfway through the circle - see attached image]

They gave you the diameter, which is 3, so divide it by 2 or multiply by 1/2 to get the radius, which will be 1.5.

A = πr²    Plug in 1.5 for r

A = π(1.5)²         Find 1.5²  [or 1.5 x 1.5 = 2.25]

A = 2.25π meters²

sweet [91]3 years ago
7 0
1.5 is the area which makes it the diameter
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In 2009 a survey of Internet usage found that 79 percent of adults age 18 years and older in the United States use the Internet.
Alex777 [14]

Answer:

0.025 = 2.33\sqrt{\frac{0.79*0.21}{n}}

Option d.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

The margin of error is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

79 percent of adults age 18 years and older in the United States use the Internet.

This means that \pi = 0.79

98% confidence level

So \alpha = 0.02, z is the value of Z that has a pvalue of 1 - \frac{0.02}{2} = 0.99, so Z = 2.33.

Which of the following should be used to find the sample size (n) needed?

We have to find n for which M = 0.025

So the equation is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.025 = 2.33\sqrt{\frac{0.79*0.21}{n}}

Option d.

4 0
3 years ago
Is this true or false pls help??
anyanavicka [17]

Answer:

FALSE

Step-by-step explanation:

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3 0
4 years ago
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What is the reminder when (3x^3-2x^2+4x-3) is divided by (x^2+3x+3)
NARA [144]
(For full answer you might have to go to the comments)

Answer: 28x+30

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3x-11
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(x^2+3x+3) 3x^3-2x^2+4x-3


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-11x^2-5x-3

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5 0
3 years ago
What is the value of the expression |a + b| + |c| when a = –5, b = 8, and c = –13?
Semmy [17]
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for the 2nd, B is the correct answer. -4.37 is smaller than -1.63, 
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Jack went to the store to buy apples. he bought 16oranges for $3.20. what is the unit rate?
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Each would be 20 cents. 

So why did he change his mind about the apples? 
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