<PRE><B>Question 215185</B>
a helicopter takes off from the roof of a building that is 200 ft above the ground. The altitude of the helicopter increases by 150 feet each second.
1. create an equation to express the altitude of a helicopter as a function of time.
h(t) =  150t + 200
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2. calculate the altitude of the helicopter 90 seconds after take off.
h(90) = 150*90 + 200 = 13700 ft.
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3. How long does it take for the helicopter to reach 20,000 feet?
20000 = 150t + 200
150t = 19800
t = 132 seconds
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Cheers,
Stan H. 
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