Solve the problem.A water tank can be filled in 7 minutes and emptied in 8 minutes. If the drain is accidentally left open when the tank is being filled, how long does it take to fill the tank?
A. 56 min
B. 
min
C. 3
min
D. 
min
Answer: A
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Solve the problem.Write (in the same base) the counting numbers just before and just after DB2sixteen.
A. CA1sixteen, EC3sixteen B. CA1sixteen, CA3sixteen C. DB1sixteen, DB3sixteen D. DBsixteen, DB4sixteen
Plot the point in the xy-plane. Tell in which quadrant or on what axis the point lies.(-6, 0) 
A. 
Quadrant II
B. 
x-axis
C. 
y-axis
D. 
x-axis
Find the exact values of s in the given interval that satisfy the given condition.[0, 2?); tan2 s = 
A. 
, 
B. 
, 
C. 
, 
, 
, 
D. 
, 
, 
, 
Solve the problem.Benjamin never has more than 21 hours free during the week. He is trying to make a weekly plan for dividing his free time between reading and working out. He wants to spend at least 7 hours per week reading. Write a system of inequalities to describe the situation. Let x represent the number of hours for reading and y represent the number of hours for working out.
A. x + y ? 21 y ? 7 x ? 0 B. x + y ? 21 x ? 7y x ? 0 y ? 0 C. x + y ? 21 x ? 7y x ? 0 y ? 0 D. x + y ? 21 x ? 7 y ? 0