1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
bija089 [108]
3 years ago
7

Find the exact area of the sector of the circle with the following radius and central angle

Mathematics
1 answer:
Lostsunrise [7]3 years ago
5 0
THe area of the whole circle is pi r^2  = 6^2 * pi = 36pi

There are 360 degrees in a crcle so this sectors area i (30/360) *36pi

=  3 pi
You might be interested in
Solve-1/8<34 then graph it
Vlada [557]

Answer:

This isn’t really a valid equation, so I’m guessing you forgot to type something.

Step-by-step explanation:

6 0
3 years ago
The state education commission wants to estimate the fraction of tenth grade students that have reading skills at or below the e
Korolek [52]

Answer:

A sample of 499 is needed.

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 given by:

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

In this question, we have that:

\pi = 0.21

90% confidence level

So \alpha = 0.1, z is the value of Z that has a pvalue of 1 - \frac{0.1}{2} = 0.95, so Z = 1.645.

How large a sample would be required in order to estimate the fraction of tenth graders reading at or below the eighth grade level at the 90% confidence level with an error of at most 0.03

We need a sample of n, which is found when M = 0.03. So

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

0.03 = 1.645\sqrt{\frac{0.21*0.79}{n}}

0.03\sqrt{n} = 1.645\sqrt{0.21*0.79}

\sqrt{n} = \frac{1.645\sqrt{0.21*0.79}}{0.03}

(\sqrt{n})^2 = (\frac{1.645\sqrt{0.21*0.79}}{0.03})^2

n = 498.81

Rounding up

A sample of 499 is needed.

8 0
3 years ago
A room contains 55 chairs arranged in rows. The number of rows is one more than twice the number of chairs per row. Find the num
miss Akunina [59]

Answer:

i believe its 27

Step-by-step explanation:25 times two= 50 27 times two= 54 +one more is 55. so it is 27

7 0
3 years ago
Read 2 more answers
Combine the like terms.<br> 7W-W+3
Bess [88]
The like terms are 7w and -w, so we can collect them to get:

6w+3

Hope this helps!! :)

7 0
3 years ago
2/7 x (-3/8) i need the answer
SOVA2 [1]
Multiply top by top
2 * -3 = -6
Multiply bottom
7 * 8 = 56
The answer is -6/56
Simplify = -3/28
8 0
3 years ago
Other questions:
  • Tito wrote the following on the board what is the unknown number 50×8
    14·2 answers
  • What is this prism called? if you want to explain it to me also thatd be great (volume and surface area) but I just need to know
    8·1 answer
  • Halp me please, 10 points! ASAP
    15·2 answers
  • The perimeter of a rectangle is 136 ft. The ratio of its length to its width is 9 : 8. What are the dimensions of the rectangle?
    6·1 answer
  • Johnny took 3 mathematics test. his score in second test was 5% higher than that in the first test. his score in third test was
    12·1 answer
  • Oliver raised his grade from an 85 to a 92 for the semester. What was the percent increase of his grade? A) .07% B) .08% C) 7% D
    10·2 answers
  • The amount of money raised at a school fundraiser is directly proportional to the number of people who attend. Last year the amo
    7·1 answer
  • DO NOT GIVE ME THE ANSWER! Please just tell me how I can find the answer!
    15·1 answer
  • Please help, thanks for understanding
    9·2 answers
  • Can some please help with this
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!