Solve the problem.A water tank can be filled in 9 minutes and emptied in 10 minutes. If the drain is accidentally left open when the tank is being filled, how long does it take to fill the tank?
A. 90 min
B. 
min
C. 
min
D. 
min
Answer: A
Mathematics
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Perform the division.(x4 - 81) ÷ (x + 3)
A. x3 + 3x2 + 9x + 27 B. x3 + 3x2 - 9x + 27 C. x3 - 3x2 + 9x - 27 D. x2 + 3x + 9
Mathematics
Solve the proportion.
= 
A. {36}
B. 
C. 
D. {1645}
Mathematics
Perform the indicated operation.(0.1) + (-0.4)
A. 0.3 B. -0.3 C. -0.5 D. 0.5
Mathematics
Solve the problem.A lottery game has balls numbered 1 through 21. What is the probability of selecting an even numbered ball or a 9?
A. 
B. 
C. 
D. 
Mathematics