Solve the problem.A boat goes 90 miles downstream in the same time it can go 60 miles upstream. The speed of the current is 4 miles per hour. Find the speed of the boat in still water.
A. 20 mph
B. 16 mph
C. 15 mph
D. 24 mph
Answer: A
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Plot the two real numbers on the real number line. Then place the appropriate inequality symbol (< or >) between them. -2, -3
A. 
-2 > -3
B.
-2 < -3
Solve the problems.Jeremy switches from drinking regular soda to drinking diet soda. If his regular soda contains 320 mg of sodium per liter and the diet soda contains 300 mg of sodium, find his percent decrease in calories by switching from regular to diet soda.
A. 6.3% B. 93.8% C. 6.7% D. 51.6%
The graph of a function is given. Choose the answer that represents the graph of its derivative.
A. 
B. 
C. 
D. 
Solve the problem.The roof of a building is in the shape of the hyperbola 
where x and y are in meters. Refer to the figure and determine the height h of the outside walls.A = 6 m
A. -14 m B. 9.3 m C. 44 m D. 86 m