Factor completely. If the polynomial cannot be factored, say it is prime.15x2 - 9xy - 20xy + 12y2
A. (3x - 4y)(5x - 3y)
B. (3x + 4y)(5x - 3y)
C. (3x - 4)(5x - 3)
D. (15x - 4y)(x - 3y)
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) = (-8x - 8y)5
A. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: lines 
B. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: lines 
c ? 0
C. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
c ? 0
D. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
Solve the problem.The northern third of Indiana is a rectangle measuring 96 miles by 132 miles. Thus, let 
Assuming that the total annual snowfall (in inches), S(x,y), at 
is given by the function S(x,y) = 60e-0.001(2x + y) with (x,y) ? D, find the average snowfall on D.
A. 52.06 inches B. 51.14 inches C. 52.44 inches D. 51.78 inches
Provide an appropriate response.Find an equation of the tangent line to the curve x2 + y2 + xy = 16 at the point (0, 2).
Fill in the blank(s) with the appropriate word(s).
Find the inverse of the function.f(x) = 5x + 3
A. f-1(x) = 
- 3
B. Not a one-to-one function
C. f-1(x) = 
D. f-1(x) = 