Solve the problem.Assume that the sales of a certain appliance dealer are approximated by a linear function. Suppose that sales were $6000 when the dealer opened five years ago and $84,000 this year. Let x = 0 represent the year the dealer opened. Find the equation giving yearly sales y.
A. y = 15,600x + 6000
B. y = 78,000x + 84,000
C. y = 15,600x + 84,000
D. y = 78,000x + 6000
Answer: A
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A. 
B. 
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D. {0, ?}
Determine where the graph of the function 
is concave upward and where it is concave downward. Also, find all inflection points of the function.
Select the correct answer. a. CU on (?2, 2), IP none b. CU on (??, ?2) and (2, ?), CD on (?2, 2), IP (?2, ?18) and (2, 18) c. CD on (?2, 2), IP none d. CU on (?2, 2), CD on (??, ?2) and , IP (?2, ?18) and (2, 18)
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A. 
B. 
C. 
D. 
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, 
< ? < ?Find cos (2?).
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B. 
C. - 
D. 