A)

b) i think that you should divide the distance by the circumference :

hope this helps
(I'm not completely sure about part b)
good luck
Ef=19, as given in the question.
Answer:
30 tennis balls
Step-by-step explanation:
30 to 50 is equal to 3 to 5. And if there are 30 baseballs for every 50 tennis balls, and there are 80 balls in total, well...
30+50=80
So there are 30 tennis balls
24 ten thousands means 24 x 10, 000 which is equivalent to 240, 000. see attached file for the illustration.
The answer is V is less than 200 cubic inches