Substitute 21 for x.
y = 21 - 4 = 17
Answer:
V = 2143.57
Step-by-step explanation:
To find the volume of a sphere you need to use this formula:

r = radius
Solve:
You need the radius from the diameter. Divide 16/2 which is
8.

V = 2143.57
Answer:
4 I think
Step-by-step explanation:
hope this help's