Combine like terms.5.9x - 1.1y - 3.4x + 7y + 2.9x
A. 5.4x + 8.1y
B. 12.2x + 5.9y
C. 5.4x + 5.9y
D. 5.4x - 1.1y + 7
Answer: C
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Solve the problem.A 200 gal tank is half full of distilled water. At time = 0, a solution containing 1 lb/gal of concentrate enters the tank at the rate of 4 gal/min, and the well-stirred mixture is withdrawn at the rate of 
When the tank is full, how many pounds of concentrate will it contain?
A. 120 pounds B. 100 pounds C. 200 pounds D. 150 pounds
Solve the problem.Given that the polar equation r = a(1 - e2)/(1 + e cos ?) models the orbits of the planets, estimate the smallest possible distance between Earth, for which 
and 
and Venus, for which 
and 
A. Zero astronomical units B. About 0.2 astronomical units C. About 0.4 astronomical units D. About 2 astronomical units
Solve.|4 - 2p|= 20
A. 
B. 
C. 
D. 
Simplify. Express your answer with positive exponents. Assume that all variables are nonzero.
A. 
B. 
C. 
D. 