Please solve and explain this question in details. 13d, 14a but i don't know why.

13. You are making a spherical snowball by rolling it through freshly fallen snow. It is very relaxing. If the surface area of the snowball is increasing at 201112/8, then how fast is the volume increasing when the diameter of the snowball is 10 cm? (a) 1007TC1'1'13/S (b) 10cm3/s 1 ' _ , 5 (c) 10770111 /s (d) 5cm3/s (e) 20 CIn3/s 2 14. Consider the curve 6IL'yLL' y2l1 = 0. How many points (x,y) on this curve have a horizontal tangent line? (a) Zero points. (b) One point. (c) Two points. (d) Three points. (e) Four points