Convert the radical expression to its rational exponent form and then simplify. Assume that all variables represent positive numbers.
A. x1/3
B. x1/2
C. x2/3
D. x3/2
Answer: C
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Given that the pair of triangles is similar, find the missing length. 
A. x = 10 B. x = 7 C. x = 15 D. x = 5
Determine whether the formula determines y as a function of x.y = 5x2 - 9x - 2
A. No B. Yes
Find the center and foci of the ellipse.
A) center: (–9, 5) foci: (–9, 3), (–9, 7)
B) center: (9, –5) foci: (9, –7), (9, –3)
C) center: (9, –5) foci: (7, –5), (11, –5)
D) center: (–9, 5) foci: (–11, –5), (–7, –5)
E) center: (9, –5) foci: (–11, 5), (–7, 5)
The DeWitt Company has found that the rate of change of its average cost of producing a product is 
, where x is the number of units and cost is in dollars. The average cost of producing 20 units is $40.00. Find the average cost of producing 140 units of the product. Round to the nearest dollar.
?
A. $46 B. $48 C. $51 D. $53 E. $58