November 26, 2015

Homework Help: Math Gr 11

Posted by Emily on Thursday, June 20, 2013 at 3:16pm.

"A rock is dropped from the edge of a 180 m cliff. the function f(x) = -5t^2 - 5t + 180 gives the height of the rock, h(t), in meters t seconds after it was released. How long does it take for the rock to reach a ledge 80 m above the base of the cliff?"
I have no idea how to solve this, steps and explanations would be amazing.

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