Simplify. Express your answer with positive exponents. Assume that all variables are nonzero.
A. x7
B. 
C. 
D. x10
Answer: A
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Evaluate the function.g(x, y) = 9y2 - 8xy; find g(5, 6).
A. 79 B. 84 C. -9 D. -15
Determine the quadrant in which the terminal side of angle ? lies.tan ? < 0 and sin ? < 0
A. Quadrant IV B. Quadrant I C. Quadrant III D. Quadrant II
Solve by the quadratic formula. If there are no real roots, say so.x2 = 9 - 4x
A. -1 ± 
B. 2 + 
C. -2 ± 2
D. -2 ± 
Solve the problem.If x is the hydrogen ion concentration of a sample of water, then the pH of that water sample is 
If the pH of the water from one lake is 6.3 and the pH of the water from a second lake is 7.6, how many times greater is the hydrogen ion concentration of the second lake than the hydrogen ion concentration of the first lake? Round your answer to the nearest hundredth.
A. 19.95 B. 6.74 C. 0.05 D. 16.08