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11. a ball is thrown up from the ground with an initial velocity of 120 feet...

11. a ball is thrown up from the ground with an initial velocity of 120 feet per second. The height s in feet can be expressed as a function of time t in seconds by s(t)=85t-16t^2 a. when does the ball reach its maximum height b. what is the maximum height c. when does the ball hit the ground

12. a farmer has 2800 feet of fencing material with which to enclose a rectangle field that borders a straight stream. If the farmer does not enclose the side bordering on the stream, what are the dimensions of the field of the maximum area? write a function that describes this situation.

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