Solve the problem.One maid can clean the house in 2 hours. Another maid can do the job in 5 hours. How long will it take them to do the job working together?
A. 
hr
B. 
hr
C. 3
hr
D. 1
hr
Answer: D
Mathematics
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Find the derivative.y = 4x2 + 10x + 5x-3
A. 8x - 15x-4 B. 8x + 10 - 15x-4 C. 8x + 10 + 15x-4 D. 4x + 5x-4
Mathematics
Solve the problem.The average daily air temperature of a certain city can be modeled by the equation 
where x is time in days with x = 1 representing January 1, and A, B, and C are constants. Solve for x.
A. x = 
sin-1 
+ B
B. x = 
sin-1 
+ C
C. x = 
sin-1 
+ C
D. x = 
sin-1 
+ B
Mathematics
Solve.A water tank can be filled in 5 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. 15 min B. 26 min C. 3 min D. 13.33 min
Mathematics
Multiply.-3(-4)(-9)
A. -118 B. 108 C. -8 D. -108
Mathematics