Solve.A commuter travels to work, driving a distance d at speed r. At the end of the day, she returns home and drives the same distance 6 mph faster, at a speed r + 6. Her average speed for the round trip can be represented by the expression 
. Simplify this expression.
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Solve the problem.A force of 1300 lb compresses a spring from its natural length of 19 in. to a length of 13 in. How much work is done in compressing it from 13 in. to 8 in.?
A. 9200 in.-lb B. 18,000 in.-lb C. 0.20 in.-lb D. 2700 in.-lb
Mathematics
Solve.Construct a box plot from the data below.
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.The period of vibration P for a pendulum varies directly as the square root of the length L. If the period of vibration is 4 sec when the length is 64 inches, what is the period when 
(Round to the nearest hundredth.)
A. 5.00 sec B. 4.75 sec C. 1.13 sec D. 4.50 sec
Mathematics
Solve the problem.If m varies directly as p, and 
when 
find m when p is 5.
A. m = 25 B. m = 81 C. m = 20 D. m = 16
Mathematics