The cost of Dig-It brand snow shovels is given by
?
?
where t is time in years since January 1, 1997. How fast, in dollars per year, is the cost increasing on October 30, 1997?
?
A. $21.85 per year
B. $18.85 per year
C. $9.42 per year
D. $20.85 per year
E. $6.00 per year
Answer: B
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A. s = 
B. s = 
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