Math 112 Final Exam Study Aid Worksheet With Answer Key Page 8
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39Math 112
Final Exam Study Aid
8 of 39
21. Rob walks up the stairs of the Sixth Street Parking
Garage at a constant rate. The time he spends travers-
ing the landings is negligible. Once he reaches the top of
the stairs, he drops a ball. Which of the following best
represents the height of the ball t seconds since he began
his ascent?
Sixth Street Parking Structure
height
height
time
time
(A)
(B)
height
height
time
time
(C)
(D)
22. The number of miles per gallon, M, for an experimental engine is given by
2000x
M =
+ 5
2
1000 + x
where x is the speed of the car in miles per hour, 10
x
60. Using your calculator,
determine the speed that yields the greatest number of miles per gallon.
(A) about 60 mph
(B) about 10 mph
(C) about 37 mph
(D) about 32 mph
(E) there is no maximum
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