The answer is 37.68
You multiply the diameter by pi (3.14). So in this problem you multiply 12 x 3.14.
Answer:
The answer to your question is the letter C
Step-by-step explanation:
Data

Process
To solve this problem just multiply the numerator by the numerator and the denominator by the denominator. If is possible, simplify the result.

Multiply the numerators (3x)(x) = 3x²
Multiply the denominators (x + 2)(x - 1) = x² + x - 2
- Join the results 
Answer:
86%
Step-by-step explanation:
1) divide 2750 by 3201 to get a part/whole ratio for a percent
2) divide and get 85.91%
I believe the answer for the first question is A. but not 100% sure, it's the only one I can figure out to be right.
The answer for the second question is C. 90% of 30 is 27.
I hope this helps.