Homework 8.4: Problem 5 (1 point) - The soot produced by a garbage incinerator spreads out in a circular pattern. The depth, H(r), in millimeters, of the soot deposited each month at a distance r kilometers.
What is the depth of the soot deposited each month at a distance of r kilometers from the garbage incinerator?

A) H(r) in millimeters
B) H(r) in centimeters
C) H(r) in meters
D) H(r) in kilometers