?Average costs. Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by 
, 
, where x is the number of machines used. What is the minimum average cost?
?
A. ?$0
B. ?$35
C. ?$490
D. ?$245
E. ?$8582
Answer: C
Mathematics
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Use rational equations to solve the problems.Frank can type a report in 3 hours and James takes 4 hours. How long will it take the two of them typing together?
A. 
hr
B. 
hr
C. 4 hr
D. 12 hr
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Solve and graph the solution set on a number line.5(2x + 6) < 15x + 5 
A. (5, ?)
B. (-?, 5)
C. [5, ?)
D. (-?, 5]
Mathematics
Simplify the expression algebraically.
What will be an ideal response?
Mathematics
Solve the equation.
= -x
A. ? B. {7, 1} C. {1} D. {7}
Mathematics