Lisa is standing on a dock beside a lake. She drops a rock from her hand into the lake. After the rock hits the surface of the lake, the rock's distance from the lake's surface changes at a rate of −3 inches per second. If Lisa holds her hand 7 feet above the lake's surface, how far from Lisa's hand is the rock 8 seconds after it hits the surface? the rock is ? inches away from Lisa's hand

The distance between Lisa hand and rock is 88 inches.

Consider the provided information. We need to find how far from Lisa's hand is the rock 8 seconds after it hits the surface. The rock's distance from the lake's surface changes at a rate of −2 inches per second. In 8 second the distance of rock and surface will be: Distance = 8×(2) = 16 inches below the surface of lake. We took positive 2 because distance can't be a negative number.

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