Sales S, in thousands of dollars, t months after the beginning of the year are given by 
.
?
The formula is valid over a 12-month period. Over what period were sales increasing? A graph of S versus t can help you answer this question.
A. From month 3 to the end of the year
B. From month 6 to the end of the year
C. Over the first 3 months
D. Over the first 6 months
Answer: C
Mathematics
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A. -25
B. 15
C. -15
D. - 
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