Subtract the polynomials. Assume all variable exponents represent whole numbers.Subtract 9x3 + 11x2y + 8xy2 + 10y3 from 2x3 + 3xy2 + 12y3.
A. 11x3 + 11x2y + 10xy2 + 22y3
B. -7x3 - 11x2y - 5xy2 + 2y3
C. -7x3 + 11x2y - 5xy2 + 2y3
D. 7x3 + 11x2y + 5xy2 - 2y3
Answer: B
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Solve the system using Gaussian elimination. 4x + 3y = -3 2x + 9y = 21
A. {(3, -3)} B. {(-3, 3)} C. ? D. {(-3, -3)}
Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = cos-1(x2 + y2)
A. Domain: all points in the x-y plane; range: all real numbers; level curves: circles with centers at (0, 0)
B. Domain: all points in the x-y plane satisfying x2 + y2 ? 1; range: real numbers - 
? z ? 
; level curves: circles with centers at (0,0) and radii r, 0 < r ? 1
C. Domain: all points in the x-y plane; range: real numbers - 
? z ? 
; level curves: circles with centers at (0, 0)
D. Domain: all points in the x-y plane satisfying x2 + y2 ? 1; range: real numbers - 
? z ? 
; level curves: circles with centers at (0, 0)
Solve the problem.Assuming two parents, four grandparents, etc., what is the total number of ancestors a person has going back 8 generations?
A. 254 B. 128 C. 510 D. 256
Determine whether or not the function is one-to-one.
A. No B. Yes