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a rock is thrown upward from a bridge into a river below. the function f(t)=-16t2+32t+94 determines...

a rock is thrown upward from a bridge into a river below. the function f(t)=-16t2+32t+94 determines the height of the rock above the surface of the water (in feet) in terms of the number of seconds t since the rock was thrown.

(A) what is the bridges height above water?

(B) how many seconds after being thrown does the rock hit the water?

(C) how many seconds after being thrown does the rock reach its maximum height above the water?

(D) what is the rocks maximum height above the water?

Math   Precalculus   
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