Simplify the rational expression. If the expression is already in simplest form, state this as your answer.
A. 1
B. -1
C. simplest form
D. y + 1
Answer: C
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Solve the problem.A tank contains 100 gal of fresh water. A solution containing 2 lb/gal of soluble lawn fertilizer runs into the tank at the rate of 1 gal/min, and the mixture is pumped out of the tank at the rate of 
Find the maximum amount of fertilizer in the tank and the time required to reach the maximum.
A. 50 pounds, 50 minutes B. 60 pounds, 40 minutes C. 48 pounds, 40 minutes D. 48 pounds, 60 minutes
Find the sum of the geometric series for those x for which the series converges.
A. 
B. 
C. 
D. 
Simplify by removing a factor equal to 1.
A. 
B. -1
C. - 
D. 1
Find the derivative of y with respect to x, t, or ?, as appropriate.y = x7ln x - 
x3
A. x7ln x - x2 + 7x6 B. 8x6 - x2 C. 7x6 - x2 D. x6 - x2 + 7x6ln x