Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by 
,
, wherexis the number of machines used. Over what interval in the domain do average costs increase?
?
A. 
B. 
C. 
D. 
E. 
Answer: B
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Use Venn diagrams to determine whether the following statements are equal for all sets A and B.(A ? B)', A' ? B'
A. equal B. not equal
Solve the problem.An election is held among five candidates (A, B, C, D, and E) and A gets a majority of the first place votes but B wins the election. Which of the following methods could have been the method used to decide this election?
A. The plurality-with-elimination method B. The Borda count method C. The method of pairwise comparisons D. all of these E. none of these
Use the discriminant to determine the number of real solutions.x2 + 3x - 7 = 0
A. One real solution B. No real solutions C. Two real solutions
Find and simplify the difference quotient of f, 
, for the function.f(x) = x2 + 7x - 8
A. 2x+ h - 8
B. 
C. 2x+ h + 7
D. 1