Answer:
b) 4x
Step-by-step explanation:

David will finish first, because if you divide Brad's miles by 2 to his miles in a 1/4 of an hour are 5.95 miles. This means David went 6.2 miles in the same time that Brad went 5.95. Therefore, David will finish first.
Hi again! yes, i believe so :)
Answer:

Step-by-step explanation:
Given
Represent the volume of the cylinder with V1 and the volume of the sphere with V2
So, from the first statement: we have:

and

To solve for
, we simply substitute
for
in 




Hence, the volume of the sphere is 
I would assume that the answer would be x=40 degrees, if not that then x=50 degrees but I would answer with x=40 degrees.