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
iragen [17]
3 years ago
7

A circle has a diameter of 8m. What is its circumference?

Mathematics
1 answer:
Maslowich3 years ago
6 0
The answer should be 25.12
You might be interested in
How do you find the radius of a circle​
tia_tia [17]

Answer:

To calculate the radius of a circle by using the circumference, take the circumference of the circle and divide it by 2 times π.

3 0
3 years ago
Read 2 more answers
The diagram shows the width and area of a rectangle.
Mademuasel [1]

Answer:

The answer can be explained here: theraleighregister.com/the-diagram-shows-the-width-and-area-of-a-rectangl.html

Step-by-step explanation:

8 0
3 years ago
A study of 420,076 cell phone users found that 131 of them developed cancer of the brain or nervous system. Prior to this study
Keith_Richards [23]

Answer:

a) 95% Confidence interval = (0.026%, 0.037%) to 3 d.p

b) The result of the 95% confidence interval does not agree with the previous rate of such cancer because the value 0.0224% does not lie within this confidence interval obtained.

Step-by-step explanation:

Confidence Interval for the population proportion is basically an interval of range of values where the true population proportion can be found with a certain level of confidence.

Mathematically,

Confidence Interval = (Sample proportion) ± (Margin of error)

Sample proportion = (131/420076) = 0.0003118483 = 0.0312%

Margin of Error is the width of the confidence interval about the mean.

It is given mathematically as,

Margin of Error = (Critical value) × (standard Error)

Critical value at 95% confidence interval for sample size of 420,076 is obtained from the z-tables because the sample size is large enough for the properties of the sample to approximate the population properties.

Critical value = 1.960 (from the z-tables)

Standard error = σₓ = √[p(1-p)/n]

n = sample size = 420,076

σₓ = √(0.0003118×0.999688/420076) = 0.0000272421 = 0.0000272

95% Confidence Interval = (Sample proportion) ± [(Critical value) × (standard Error)]

CI = 0.000312 ± (1.96 × 0.0000272)

CI = 0.000312 ± 0.0000534

95% CI = (0.0002586055, 0.0003653945)

95% Confidence interval = (0.000259, 0.000365)

95% Confidence interval = (0.0259%, 0.0365%) = (0.026%, 0.037%) to 3 d.p

b) The result of the 95% confidence interval does not agree with the previous rate of such cancer because the value 0.0224% does not lie within this confidence interval obtained.

Hope this Helps!!!

7 0
3 years ago
How are the integers and rational numbers different? ...?
vlabodo [156]
Integers<span>: Whole </span>numbers<span> and the opposites of whole </span>numbers<span>. 
</span>
Rational Numbers<span>: </span>Numbers<span> that can be written as a fraction (or ratio) of two </span>integers<span>. </span>
5 0
3 years ago
66 is 3/4 of what number
Anarel [89]

Answer:88

Step-by-step explanation:

Divide 66 by 3 (66/3)

Then you should get 22

Multiply 22 by 4 (22 x 4)

Answer: 88

3 0
3 years ago
Other questions:
  • Hello can someone please help with this question.
    10·2 answers
  • 3x<br> __ +2= 4x-1 <br> 4<br><br> PLZ HELP ME OMG
    6·1 answer
  • each of the 28 students in romi's class raised at least $25 during the jump-a-thon. what is the least amount of money the class
    11·1 answer
  • HELLO!!! PLEASE HELP?! BRAINLIEST ANSWER INCLUDED! A sample of 130 firecrackers contained 9 duds. How many duds would you expect
    10·2 answers
  • Consider the following function: f(x) = x² - 4
    13·1 answer
  • Solve for x.<br><br> (8x+1)=(21x+5)
    10·2 answers
  • Can someone please help me with geometry. Honestly I need help. Let me know please! :)
    13·1 answer
  • Chess Club is selling stuffed animals for Valentine's Day. It costs the council $2.00 per stuffed animal and a one time shipping
    9·1 answer
  • **Help with slope test assignment**
    12·2 answers
  • What is sin 63°? Round your answer to the nearest hundredth
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!