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? Round your answer to the nearest dollar. 
?

A. $0
B. $35
C. $490
D. $245
E. $8,582


Answer: C

Mathematics

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Find the largest open interval where the function is changing as requested.Increasing y = (x2 - 9)2

A. (-?, 0) B. (-3, 0) C. (-3, 3) D. (3, ?)

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Evaluate. If necessary, find common denominators and simplify completely.5 + 8 - 2

A. 10
B. 10
C. 10
D. 10

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Perform the indicated operations. Write the resulting polynomial in standard form.(6x + 11y)2

A. 6x2 + 121y2 B. 6x2 + 132xy + 121y2 C. 36x2 + 121y2 D. 36x2 + 132xy + 121y2

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Write out the first five terms of the sequence.{sn} = 

A. s1 = , s2 = , s3 = , s4 = , s5 = 
B. s1 = , s2 = , s3 = , s4 = , s5 = 
C. s1 = , s2 = , s3 = , s4 = , s5 = 
D. s1 = , s2 = , s3 = , s4 = , s5 = 

Mathematics