# CHAPTER 3 Polynomial and Rational Functions/ha58. Height of a Projected Rock A rock is projected directly upward from ground levelwith an initial velocity of 90 ftper sec.(a) Give the function that describes the height of the rock in terms of time t.(b) Determine the time at which the rock reaches its maximum height and the maxi-mum height in feet.(c) For what time interval will the rock be more than 120 ft above ground level?(d) After how many seconds will it hit the ground?59. Area ofa Parking Lot One campus ofHouston Community College has plans toconstruct a rectangular parking lot on landbordered on one side by a highway. Thereare 640 ft of fencing available to fence theother three sides. Let x represent the lengthof each of the two parallel sides of fencing.XX(a) Express the length of the remaining sideto be fenced in terms of x.(b) What are the restrictions on x?(c) Determine a function sA that represents the area of the parking lot in terms of x.(d) Determine the values of x that will give an area between 30,000 and 40,000 ft2.(e) Wht dimensions will give a maximu

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Asked Oct 19, 2019
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for max. height at heighst point...

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