Simplify the expression.
A. 25
B. 8.368
C. 5
D. not a real number
Answer: C
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Use a calculator to perform the operation. Express your answer in scientific notation.
A. 1.39 × 10-1 B. 1.39 × 10-3 C. 1.388728918 × 10-11 D. 1.39 × 10-11
Solve the problem.The cost, in millions of dollars, for a company to manufacture x thousand automobiles is given by the function 
Find the number of automobiles that must be produced to minimize cost.
A. 45 thousand automobiles B. 3 thousand automobiles C. 9 thousand automobiles D. 6 thousand automobiles
Find the mean. Round to the nearest tenth unless otherwise stated.Average number of defects: 8.0, 8.2, 8.8, 7.5, 8.3, 8.0, 8.7, 8.8, 7.1, 8.0, 7.5, 7.7, 7.5, 8.2, 8.2, 6.9, 8.3, 8.7
A. 8.3 B. 7.6 C. 8.0 D. 8.5
Find an equation of a parabola satisfying the given conditions.Focus at (2, 0), directrix x = -2
A. x = 
y2
B. -8y = x2
C. y2 = -8x
D. y = 
x2