Solve the problem.A water tank can be filled in 6 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. 3
min
D. 24 min
Answer: D
Mathematics
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Find the value of d2y/dx2 at the point defined by the given value of t.x = 9 sin t, y = 9 cos t, t = 
A. 2
B. -2
C. - 
D. 
Mathematics
Evaluate using the correct order of operation.
+ 
× 
A. 
B. 
C. 
D. 
Mathematics
Express as an equivalent expression without exponents.b1
A. 0 B. b C. 1 D. -1
Mathematics
Solve the problem.Carla takes a job with a starting salary of $26,000 for the first year with an annual increase of 6% beginning in the second year. What is Carla's salary, to the nearest dollar, in the seventh year?
A. $39,162 B. $36,881 C. $37,395 D. $35,480
Mathematics