Asked by Alex

Suppose the height, h, in feet, of a trampolinist above the ground during one bounce is modelled by the quadratic function h(t) = -16t^2 + 42t + 3.75 . For what period of time is the trampolinist at least 22 ft above the ground? Round your answers to the nearest hundredth. (2 marks)
Answered by Steve
http://www.wolframalpha.com/input/?i=-16t^2+%2B+42t+%2B+3.75+%3E%3D+22
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