Use the limit rules to determine the limit.
f(x) , where f(x) = 
A. 9
B. 121
C. -24
D. -23
Answer: C
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Match the following statements and reasons to complete the proof of:
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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. How many machines give minimum average costs?
?
A. Using 25 machines gives the minimum average costs. B. Using zero machines gives the minimum average costs. C. Using 35 machines gives the minimum average costs. D. Using 50 machines gives the minimum average costs. E. Using 55 machines gives the minimum average costs.
Find the vertex, the focus, and the directrix of the parabola.y2 - 8x + 2y + 9 = 0
A. V: 
; F: 
; D: y = 
B. V: (1, -1); F: (3, -1); D: x = -1
C. V: 
; F: (-1, 1); D: y = 3
D. V: (5, 1); F: (9, 1); D: y = 7
Evaluate the algebraic expression.
, for m = 2
A. 
B. 
C. 
D. 