Solve.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. 
min
B. 
min
C. 56 min
D. 3
min
Answer: C
Mathematics
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Classify as true or false.If GCD(a, b) = 1, then LCM(a, b) = ab.
A. True B. False
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Find a polynomial equation with real coefficients that has the given roots.4i, 
A. x4 + 9x2 - 112 = 0 B. x4 + 18x2 + 112 = 0 C. x4 - 18x2 + 112 = 0 D. x4 - 9x2 - 112 = 0
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Determine the area of the triangle. If necessary, round the answer to two decimal places. 
A. 35.45 B. 8.86 C. 10.9 D. 1.56
Mathematics
Solve the equation.
= 
+ 6
A. 
B. 6
C. 
D. 
Mathematics