Find any relative extrema.f(x, y) = 
+ xy - 
A. f(
, -4) = 2, relative maximum
B. f(-
, 4) = -6, relative minimum
C. f(-
, 4) = -6, relative maximum
D. f(
, -4) = 2, relative minimum
Answer: C
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Solve the following system by any appropriate method. If there is no real number solution, so state.xy = 90x + y = -19
A. (9, -10), (10, -9) B. (-9, -10), (-10, -9) C. (9, 10), (10, 9) D. (-9, 10), (-10, 9)
Does the graph represent a function that has an inverse function?
A. No B. Yes
Simplify the fraction. If the fraction is already simplified, so state.
A. 
B. 
C. simplified
D. 
Solve the problem.Two pumps can fill a water tank in 45 minutes when working together. Alone, the second pump takes 3 times longer than the first to fill the tank. How long does it take the first pump alone to fill the tank?
Fill in the blank(s) with the appropriate word(s).