posted by Trevor .
1a. 15 ft ladder is placed against a vertical wall. the bottom of the ladder is sliding away from the wall at a rate of 2 ft/sec. How fast is the top of the ladder sliding down the wall when the bottom of the ladder is 9 ft from the wall?
1b. Using the data in the first part, Find the rate of change of the area of the triangle formed by the ladder, the ground, and the wall when the bottom of the ladder is 9ft from the wall.