We all know that
V(r) = 4pi/3 r^3
clearly, f(t) = 21-4.5t
V(f(t)) = 4pi/3 (21-4.5t)^3
Now just plug in your numbers
The volume V (r) of a sphere is a function of its radius r. Suppose a spherical snowball with a
radius 2 f t started to melt so that the radius is changing at a constant rate of 4.5 inches per minute.
If f(t) feet is the radius of the snowball after t minutes, do the following:
a. Compute (V ◦ f)(t) and interpret your result.
[Hint: Find V (r) first.]
b. Find the volume of the snowball after 3 minutes
2 answers
the answer in letter b please