Question 12 (1 point) The volume V of a tumor can be approximated by V (r) = zar where r is the radius of the tumor, in centimeters. The rate of change of the volume at r = 1.3 cm is: Note: For consistence in the calculations, round up the final number (the answer) of the calculations so if you get 2.0456 it will be 3 and if you will get 2.8912 it will be 3. a) 3 cm2 O b) 4 cm 2 O c) 5 cm 2 O d) 6 cm 2