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
777dan777 [17]
3 years ago
12

The circumference of a circle is 65π. In terms of pi, what is the area of the circle?

Mathematics
1 answer:
iren2701 [21]3 years ago
7 0
Circumerence=2pi(r)
circumerence=65pi
65pi=2pir
divide both sides by pi
65=2r
divide both sides by 2
32.5=r

area=pir^2
area=pi32.5^2
area=pi1056.25
area=1056.25pi
You might be interested in
Which decimal number is less than 1.56?
Digiron [165]

The decimal number is 0.9

3 0
3 years ago
Find the ratio of:<br> (a) 5 km to 400 m<br> (b) 2 hours to 160 minutes
aleksandr82 [10.1K]

Answer:

Answer - a) 1:80

               b) 1:80

Step-by-step explanation:

All the ratio should be written in lowest form. these are the answers for both the questions.

Pls Mark Brainliest !!!!!!!!!!!!!!

6 0
2 years ago
Read 2 more answers
A company surveyed 2400 men where 1248 of the men identified themselves as the primary grocery shopper in their household. ​a) E
polet [3.4K]

Answer:

a) With a confidence level of 98%, the percentage of all males who identify themselves as the primary grocery shopper are between 0.4962 and 0.5438.

b) The lower limit of the confidence interval is higher that 0.43, so if he conduct a hypothesis test, he will find that the data shows evidence to said that the fraction is higher than 43%.

c) \alpha =1-0.98=0.02

Step-by-step explanation:

If np' and n(1-p') are higher than 5, a confidence interval for the proportion is calculated as:

p'-z_{\alpha/2}\sqrt{\frac{p'(1-p')}{n} }\leq  p\leq p'+z_{\alpha/2}\sqrt{\frac{p'(1-p')}{n} }

Where p' is the proportion of the sample, n is the size of the sample, p is the proportion of the population and z_{\alpha/2} is the z-value that let a probability of \alpha/2 on the right tail.

Then, a 98% confidence interval for the percentage of all males who identify themselves as the primary grocery shopper can be calculated replacing p' by 0.52, n by 2400, \alpha by 0.02 and z_{\alpha/2} by 2.33

Where p' and \alpha are calculated as:

p' = \frac{1248}{2400}=0.52\\\alpha =1-0.98=0.02

So, replacing the values we get:

0.52-2.33\sqrt{\frac{0.52(1-0.52)}{2400} }\leq  p\leq 0.52+2.33\sqrt{\frac{0.52(1-0.52)}{2400} }\\0.52-0.0238\leq p\leq 0.52+0.0238\\0.4962\leq p\leq 0.5438

With a confidence level of 98%, the percentage of all males who identify themselves as the primary grocery shopper are between 0.4962 and 0.5438.

The lower limit of the confidence interval is higher that 0.43, so if he conduct a hypothesis test, he will find that the data shows evidence to said that the fraction is higher than 43%.

Finally, the level of significance is the probability to reject the null hypothesis given that the null hypothesis is true. It is also the complement of the level of confidence. So, if we create a 98% confidence interval, the level of confidence 1-\alpha is equal to 98%

It means the the level of significance \alpha is:

\alpha =1-0.98=0.02

4 0
3 years ago
Simplify (18x^4 – 3x^3 – 2x^3 + x^2 – 10 + 6), showing how you got your answer would be preferable!
Crazy boy [7]

Answer:

1

8

4

−

3

3

−

2

3

+

2

−

1

0

+

6

18

x

4

−

3

x

3

−

2

x

3

+

x

2

−

10

+

6

18x4−3x3−2x3+x2−10+6

1

8

4

−

3

3

−

2

3

+

2

−

4

18

x

4

−

3

x

3

−

2

x

3

+

x

2

−

4

18x4−3x3−2x3+x2−4

2

Combine like terms

Solution

1

8

4

−

5

3

+

2

−

4

Step-by-step explanation:

7 0
3 years ago
The area of a triangle is 200ft<br> what does x have to be
san4es73 [151]
100ft that is the answer
5 0
3 years ago
Other questions:
  • PLEASE HELP, I ONLY HAVE 30 MINUTES
    13·1 answer
  • 1) -13(-6x- 14) = -910 solve
    7·1 answer
  • Abel planned for a garden to be 42 m long but found that it needs to be 24 m long to fit in his backyard. He found the change of
    13·2 answers
  • What is 3/18 and 12/20 simplified
    9·2 answers
  • SOLVE THE EQUATION<br> −9(x + 6) + 60 = 13 − 10x
    6·1 answer
  • Solve 4x − 2(x + 1) = 3x + 10. (5 points)
    11·1 answer
  • Fycgvhbkjnlmlmjiohugyftdxzs hi
    12·1 answer
  • Angle K and angle L are complementary angles. If angle k = (3x + 3)" and angle k= (10x - 4)". find the
    10·1 answer
  • The edge of a cube is 6 inches. What is the total surface area of the package?​
    7·1 answer
  • Which of the ratios below is equivalent to 1:8? Select all that apply.
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!