Is the following correspondence a function?
A. Yes
B. No
Answer: A
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Solve the problem.The annual wheat production of a particular region can be modeled by the polynomial 
where r is the number of years since this data was first recorded. The wheat acreage harvested annually is modeled by 
Find a polynomial that represents the annual yield per acre of wheat harvested.
A. 5r2 + 2r + 5
B. r2 + 5 r + 2
C. 5r2 - 2r - 5
D. 5r2 + 2r + 
Write the interval as an inequality involving x. Graph the inequality.(-?, 0]
A. x ? 0
B. x > 0
C. x ? 0
D. x < 0
Write the rate as a unit rate.16 cents for 4 marbles
A. 0.25 cents/marble B. 20 marbles C. 4 cents/marble D. 64 cents/marble
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)