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 −6 inches per second. If Lisa holds her hand 4 feet above the lake's surface, how far from Lisa's hand is the rock 6 seconds after it hits the surface?

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smithtamyabianca3064 smithtamyabianca3064

04-06-2015
Mathematics

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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 −6 inches per second. If Lisa holds her hand 4 feet above the lake's surface, how far from Lisa's hand is the rock 6 seconds after it hits the surface?

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