Solve the problem.If the average cost per unit C to produce x units of plywood is given by 
what is the unit cost for 40 units?
A. -$12.50
B. $16.67
C. $37.50
D. $0.75
Answer: B
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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
Write an inequality whose solution set is the interval.(-?, 22)
A. x ? 22 B. x > 22 C. x ? 22 D. x < 22
Find.
?
Fill in the blank(s) with the appropriate word(s).
Evaluate the expression without using a calculator.log121
A. 12
B. 0
C. 
D. 1