A rock is thrown upward from a bridge into a river below. The function f(t)=−16t2+38t+128f(t)=-16t2+38t+128 determines the height of the rock above the surface of the water (in feet) in terms of the number of seconds tt since the rock was thrown. To help you answer questions c. and d. you may want to graph f.f. What is the bridge's height above the water? _ feet    How many seconds after being thrown does the rock hit the water? _ seconds    How many seconds after being thrown does the rock reach its maximum height above the water? _ seconds    What is the rock's maximum height above the water?

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