Diameter = 30
30/2 = 15 15 is the radius
To find area:
3.14 x 15 x 15 = 706.5
706.5 is the answer
They are equal. There are 3 feet in one yard so 3x4=12.
Answer:
Step-by-step explanation:
Use pythagoras: a^2+b^2=c^2
so rearrange to b^2=a^2-c^2
so 8^2-5^2
64-25=39
Square root
square root of 39 is 6.2 miles is the answer
Answer:
the answer is D brainliest please
Step-by-step explanation:
He should use a sample size of 655.
We can use the formula
We find the z-value by first subtracting the confidence level from 1:
1 - 0.8 = 0.2
Divide this by 2:
0.2/2 = 0.1
Subtract this from 1:
1 - 0.1 = 0.9
Using a z-table (http://www.z-table.com) we find the z-score associated with this is 1.28.
Now we plug our information into our formula: