35. A pizzeria starts with 30 in of dough in the shape of a thick cylinder and rolls it out to form a thin crust pizza. Assuming the dough is always in the shape of a cylinder where the thickness is decreasing at a constant rate of = in/sec, how fast is the radius changing when the dough has diameter of 8 inches. 36. A conical cup is 6 inches tall and 4 inches diameter at the top. If water is being added at a rate of IN in3/ sec, at what rate is the depth of water increasing when the water is 2/3 full