A man 1.75 m tall walks at a rate of 2m/s toward a streetlight that is 10m above the ground, at what rate is the length of the shadow changing when he is 6m from the base of the light? Don't know what to do. => Pythagorean? #2: A rectangle with base an x axis is inclined under y = 6 - x^2, Find the height of the rectangle whose area is as large as possible. h = 6, when y' = 0? A = 6*base, A' = 6?