The sides of a square increase in length at a rate of 3 mlsec. a. At what rate is the area of the square changing when the sides are 13 m long? b. At what rate is the area of the square changing when the sides are 20 m long? 3. Write an equation relating the area of a square, A, and the side length of the square, 5. D Differentiate both sides of the equation with respect to t. dA _ ds a - (D) a The area of the square is changing at a rate of El |:l when the sides are 13 rn long. b. The area of the square is changing at a rate of D E when the sides are 20 m long. For the following composite function, find an inner function u = g(x) and an outer function y = f (u) such that y = f(g(x)). Then calculate dx y= V -9-7x . . . Select the correct choice below and fill in the answer box to complete your choice. dy d d O A. dx du ( Vu). (-9-7x) = 14 dx O B. My d d dx du ( Vu ) . ( - 7x) = dx dy d d O C. dx du -(-9-7u) . (Vx) = dy d d OD. (u). dx du dy (- 9- 7x) =