Solve.If the height of a rectangular solid is held constant, the volume varies jointly with the length and the width. If the volume is 128 cubic inches when the length is 8 inches and the width is 4 inches, find the volume when the length is 7 inches and the width is 5 inches.
A. 105 in.3
B. 140 in.3
C. 112 in.3
D. 160 in.3
Answer: B
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Solve the given applied problem.A coffee shop has seating for 80 customers and the daily gross profit per seat is $11. If seating capacity in increased the daily gross profit on each place will be decreased by $0.07 times the number of places above 80. Find the seating capacity which will yield the greatest daily gross profit 
A. 111 B. 131 C. 118 D. 114
Determine whether the proportion is true or false.
= 
A. True B. False
Solve the problem.A building needs a ramp to make it handicap accessible. By law, the ramp must run 10 inches horizontally for every 1 inch of rise. If the surface of the ramp is 52 inches long how far above the ground is the inclined end of the ramp? Round to the nearest tenth of an inch.
A. 4.7 in. B. 4.1 in. C. 17.3 in. D. 5.2 in.
Write a formula to express the relationship. Use k as the constant of variation.The altitude h of an equilateral triangle varies directly as one side s.
A. h = ks
B. h = ks2
C. h = 
D. h = 