I am certain the answer is C. Algebra properties are used in proofs. Postulates are definitely used. And definitions are explanations. So, it is C.
Answer:

Step-by-step explanation:
Cylinder volume formula is 




Answer:
$24
Step-by-step explanation:
What you do is you just times 84 x 2/7 to get your answer.
84 x 2/7=$24 is your answer.
Answer:
2.0625
Step-by-step explanation:
Convert the fraction to a decimal by dividing the numerator by the denominator.