Solve the problem.Assume that the price per unit d of a certain item to the consumer is given by the equation 
where x is the number of units in demand. The price per unit from the supplier is given by the equation 
where x is the number of units supplied. Find the equilibrium price and the equilibrium quantity.
A. equilibrium price: $35 per unit; equilibrium quantity: 50 units
B. equilibrium price: $50 per unit; equilibrium quantity: 30 units
C. equilibrium price: $20 per unit; equilibrium quantity: 50 units
D. equilibrium price: $30 per unit; equilibrium quantity: 50 units
Answer: D
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Find the reciprocal.
A. -1
B. -15
C. 
D. 15
Solve the problem.The distance D that a spring is stretched by a hanging object varies directly as the weight W of the object. If a 24-kg object stretches a spring 37 cm, how far will a 16-kg weight stretch the spring?
A. 77 cm B. 10.3784 cm C. 24.67 cm D. 1.54166667 cm
Solve the problem.A boat goes 160 miles downstream in the same time it can go 120 miles upstream. The speed of the current is 8 miles per hour. Find the speed of the boat in still water.
A. 28 mph B. 56 mph C. 48 mph D. 64 mph
Convert the units using unit fractions.8250 lb = 
tons
A. 8
B. 4
C. 3
D. 5