Rate of Change A 25-foot ladder is leaning against a house (see figure). If the base of the ladder is pulled away from the house at a rate of 2 feet per second, then the top will move down the wall at a rate of
(a) Find the rate r when x is 7 feet.
(b) Find the rate r when x is 15 feet.
(c) Find the limit of r as x approaches 25 from the left.
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