Use the laws of exponents to simplify each expression using positive exponents only. Assume all variables represent nonzero real numbers.(-5x6y-7)(3x-1y)
A. 
B. 
C. 
D. -15x5y8
Answer: A
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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; range: all real numbers; level curves: circles with centers at 
B. Domain: all points in the xy-plane satisfying x2 + y2 ? 9; range: real numbers 0 ? z ? 3; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 3
C. Domain: all points in the xy-plane satisfying x2 + y2 = 9; range: real numbers 0 ? z ? 3; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 3
D. Domain: all points in the xy-plane; range: real numbers 0 ? z ? 3; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 3
Make the requested preference schedule.Ten voters are asked to rank 3 brands of shoes: A, B, and C. The ten voters turn in the following ballots showing their preferences in order:
Make a preference schedule for these ballots.
A. 
B. 
C. 
D. 
Decide whether the ordered pair is a solution of the given system.(4, -2)x + y = -6x - y = -2
A. Yes B. No
Express the number as a power of 10.1,000,000,000
A. 109 B. 108 C. 1010 D. 1011