A ladder 25 ft. long is leaning against a house.

A ladder 25 ft. long is leaning against a house. At time t=0, the base of the ladder is 7 feet from the wall, and the base of the ladder starts to move away from the wall at a constant rate of 2 feet per second.a) How far is the top of the ladder from the ground at t=0b) How far is the base of the ladder from the wall and how far is the top of the ladder from the ground at t=4? c) At t=8.5 secons, how far is the base of the ladder from the wall and how far is the top of the ladder from the ground?