The circular plate is being heated so that radius is increasing at the rate of 0.09in/h. How fast is area increasing when the radius is = 15 inches?
four possible solutions:
Option A: 20.25 p in^2/h
Option B: 2.7 in^2/h
Option C: 20.25 in^2/h
Option D: 2.7 p in^2/h
Describe the solution.