Solve the problem.From a point on a river, two boats are driven in opposite directions, one at 6 miles per hour and the other at 12 miles per hour. In how many hours will they be 54 miles apart?
A. 1 hr
B. 4 hr
C. 5 hr
D. 3 hr
Answer: D
Mathematics
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Solve the problem.The velocity of water ft/s at the point of discharge is given by 
where P is the pressure 
of the water at the point of discharge. Find the rate of change of the velocity with respect to pressure if the pressure is 
A. 0.1354 ft/s per lb/in2 B. 0.9574 ft/s per lb/in2 C. 47.87 ft/s per lb/in2 D. 1.91 ft/s per lb/in2
Mathematics
Determine the absolute value of the complex number.z = -9 - 6i
A. i
B. 3
C. 3
D. i
Mathematics
Solve the equation.8x = 12
A. 
B. 
C. 
D. 
Mathematics
Solve the system by graphing.
A. 
B. 
C. Infinitely many solutions
D. Inconsistent
Mathematics