Find the open intervals where the function is concave upward or concave downward. Find any inflection points.
A. Concave upward on (0, ?); concave downward on (-?, 0); inflection point at (0, -1)
B. Concave upward on (0, ?); concave downward on (-?, 0); inflection points at (-4, 0), (-1, 0), and 
C. Concave upward on (-1, ?); concave downward on (-?, 2); inflection points at (-1, 0) and (2, -3)
D. Concave upward on (-1, ?); concave downward on (-?, 2); inflection point at (2, -3)
Answer: A
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Solve the problem.Assume that the sales of a certain appliance dealer are approximated by a linear function. Suppose that sales were $7500 in 2007 and $56,500 in 2012. Let x = 0 represent 2007. Find the equation giving yearly sales y.
A. S(x) = 49,000x + 56,500 B. S(x) = 9800x + 7500 C. S(x) = 49,000x + 7500 D. S(x) = 9800x + 56,500
Simplify. Assume that no radicands were formed by raising negative quantities to even powers.
A. 
B. 
C. 
D. 
Solve the problem.Edwin has a board that is 9.6 feet long. He wants to cut the board into pieces that are 2.4 feet long. How many 2.4-foot pieces will he get from the large board?
A. 4 pieces B. 5 pieces C. 40 pieces D. 3 pieces
Translate to a proportion and solve. When necessary, round to the nearest hundredth.What is 150% of 3330?
A. 4995 B. 499,500 C. 49,950 D. 500