Answer: Use the information below to solve Exercises 81

Chapter 5, Problem 84

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Use the information below to solve Exercises 81 and 82. The surface area of a rectangular box is given by the polynomial functionSA = 2HL + 2LW + 2HWand is measured in square units. In business, surface area is often calculated to help determine cost of materials.A worker at the Hoover Dam bypass bridge was spendinghis lunch break tossing a football. He threw the ball upwardwith an initial velocity of 10 feet per second but missedthe ball, and it went over his head and down toward theriver. The height of the football above the Colorado Riverat any time t can be described by the polynomial functionP1t2 = -16t2 + 10t + 910. Find the height of the footballat each given time.a. t = 0 secondsb. t = 12 secondc. t = 3 secondsd. t = 5 secondse. Explain why the height increases and then decreases astime passes.f. Approximate (to the nearest second) how long beforethe football lands in the river.

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