Solve.The speed of a stream is 4 mph. If a boat travels 84 miles downstream in the same time that it takes to travel 42 miles upstream, what is the speed of the boat in still water?
A. 15 mph
B. 14 mph
C. 12 mph
D. 8 mph
Answer: C
Mathematics
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Solve the problem.A repair company's charge for repairing a certain type of copy machine fits the model 
where y is the amount charged in dollars and x is the number of minutes the repair person is on the job. How many minutes would it take for the cost of repair to reach $130? (Round to the nearest minute.)
A. 13 min B. 134 min C. 287 min D. 203 min
Mathematics
Find an equation of variation if the following conditions exist.Suppose that y varies directly as z and y = 10 when z = 80.
A. y = 
z
B. y = 8z
C. y = -2z
D. y = - 
z
Mathematics
Graph the function.y = 3 cos (3x - ?)
A. 
B. 
C. 
D. 
Mathematics
Use graphs to find the set.(-?, 9) ? [-2, 12)
A. (-?, 12) B. [-2, 9) C. (9, 12) D. (-?, -2]
Mathematics