Solve the problem.If the average cost per unit C(x) to produce x units of plywood is given by C(x) = 
, what is the unit cost for 20 units?
A. $25.00
B. $75.00
C. $1.50
D. $21.43
Answer: D
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Simplify. If an expression does not represent a real number, state this.
A. 19 B. -7 C. ±7 D. 49
Find all integer factors of the given number.42
A. -42, -14, -6, -7, 7, 6, 14, 42 B. -42, -21, -14, -6, -7, -3, -2, -1, 1, 2, 3, 7, 6, 14, 21, 42 C. -42, -28, -14, -6, -7, -3, -2, -1, 1, 2, 3, 7, 6, 14, 28, 42 D. -42, -7, -1, 1, 7, 42
Evaluate the trigonometric function for the given value of t.cos t, t = 
A. - 
B. 
C. 
D. - 
Find the absolute maximum and absolute minimum values of the function, if they exist, over the indicated interval. When no interval is specified, use the real line (-?, ?). f(x) = - 
x3 + 4x - 1; (-?, 0)
A. Absolute maximum: 2; absolute minimum: -2 B. No absolute maximum; absolute minimum: -6.3 C. Absolute minimum: -4.3; absolute maximum: 6.3 D. No absolute extrema