Question

ap calc ab

the sides of a rectangle are chaning as follows: the length is decreasing at a rate of 3 inches per second, the width is increasing at a rate of 6 inches per second. at the instant the length is 10 inches and the width is 4 inches

a. how is the area of the rectangle changing?
b. how is the perimeter of the rectangle changing?
c. how is the length of the diagonal of the rectangle changing?