Can you please help me? I'm doing derivatives.

1 1. (14 pts] The position of an object at Lime I is given by 5( : E r411r3+?2t264r, where r is measured in seconds, and s is measured in meters. (a) Find all times when the object changes direction. \f2. (12 pts) A ladder 25 feet long is leaning against the wall of a house (see figure). The base of the ladder is pulled away from the wall at a rate of 2 feet per second. 25 ft ft 2 sec (a) How fast is the top of the ladder moving down the wall when its base is 7 feet from the wall?[h] Consider the triangle formed by the side of the house, the ladder, and the ground. Find the rate at which die area of the triangle is (hanging when the base of the ladder is '7 feet from die wall