804
Answer Key
91 . a. Average rate at which customers spent on concessions in thousands per customer. b. Rate (in thousands per customer) at which x customers spent money on concessions in thousands per customer. 93 . a. Average grade received on the test with an average study time between two values. b. Rate (in percentage points per hour) at which the grade on the test increased or decreased for a given average study time of x hours. 95 . a. Average change of atmospheric pressure between two different altitudes. b. Rate (torr per foot) at which atmospheric pressure is increasing or decreasing at x feet. 97 . a. The rate (in degrees per foot) at which temperature is increasing or decreasing for a given height x . b. The rate of change of temperature as altitude changes at 1000 feet is −0.1 degrees per foot. 99 . a. The rate at which the number of people who have come down with the flu is changing t weeks after the initial outbreak. b. The rate is increasing sharply up to the third week, at which point it slows down and then becomes constant. 101 . Time (seconds) h ′ ( t ) (m/s)
0
2
1
2
2
5.5
3
10.5
4
9.5
7
5
103 . G ′( t ) =2.858 t +0.0857
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