Solve the problem.A water tank can be filled in 5 minutes and emptied in 7 minutes. If the drain is accidentally left open when the tank is being filled, how long does it take to fill the tank?
A. 24 min
B. 2 min
C. 10 min
D. 17
min
Answer: D
Mathematics
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Solve the problem.Find the centroid of the infinite region in the first quadrant bounded by the coordinate axes and the curve 
.
A. 
= 
, 
= 
B. 
= 
, 
= 
C. 
= 
, 
= 
D. 
= 
, 
= 
Mathematics
Find the product.
A. Undefined
B. 
C. 
D. 
Mathematics
Fill in the blank with one of the words or phrases listed below.
To convert from one unit of length to another, 
may be used.
A. weight B. energy C. mass D. unit fractions
Mathematics
Simplify the expression.
A. 
B. 
C. a - 2b + 1
D. a - b
Mathematics