Solve.One pump can drain a pool in 9 minutes. When a second pump is also used, the pool only takes 6 minutes to drain. How long would it take the second pump to drain the pool if it were the only pump in use?
A. 3
min
B. 51 min
C. 
min
D. 18 min
Answer: D
Mathematics
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Solve the following equations for the unknown shown:
a. a + 13 = 20 b. 2x + 7 = 13 c. x + 20 = 9 d. 3a - 14 = 7
Mathematics
Find the sum.+15 + (-48)
A. -63 B. 63 C. -33 D. -64
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Perform the indicated operations and simplify the result. Leave the answer in factored form.
A. 
B. 
C. 
D. 
Mathematics
Find 
for
and 
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A. 
B. 
C. 
D. limit does not exist
E. 
Mathematics