Solve the polynomial inequality by graphing.(x + 4)(x2 - 4) > 0
A. (-4, 2)
B. (-?, -2) ? (2, ?)
C. (-4, -2) ? (2, ?)
D. (-?, 2) ? (2, 4)
Answer: C
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 
A. Domain: all points in the xy-plane satisfying x2 + y2 = 81; range: real numbers 0 ? z ? 9; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 9
B. Domain: all points in the xy-plane; range: real numbers 0 ? z ? 9; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 9
C. Domain: all points in the xy-plane; range: all real numbers; level curves: circles with centers at 
D. Domain: all points in the xy-plane satisfying x2 + y2 ? 81; range: real numbers 0 ? z ? 9; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 9
Factor when possible. If the polynomial is prime, say so.x2 + 4xy - 32y2
A. (x - 4y)(x + 8y) B. (x + 4y)(x + y) C. (x + 4y)(x + 8y) D. prime
Solve the problem.A fossilized leaf contains 30% of its normal amount of carbon 14. How old is the fossil (to the nearest year)? Use 5600 years as the half-life of carbon 14.
A. 2876 B. 9709 C. 34,262 D. 27,429
Convert the number in the sentence to standard notation.The total sales of Acme Manufacturing Company for the last four years was $75.91 million.
A. $75,910,000 B. $7,591,000 C. $759,100,000 D. $75,910,000,000