Posted by **Josh** on Tuesday, November 3, 2009 at 8:26pm.

The volume of a growing spherical cell is given below, where the radius is measured in micrometers (1 µm = 10^-6m).

V = 4/3pi r^3

(a) Find the average rate of change of V with respect to r when r changes from 2. Evaluate your answers numerically.

(i) 2 to 5 µm ? µm2

(ii) 2 to 3 µm ? µm2

(iii) 2 to 2.1 µm ? µm2