Suppose that sales (in dollars) are directly related to an advertising campaign according to 
, where t is the number of weeks of the campaign. Find the rate of change of sales after 8 weeks and interpret your answer. Round your answer to two decimal places.
?
A. -2.25. So, during the 9th week, the model predicts that sales will decrease approximately $2.25.
B. -24.79. So, during the 9th week, the model predicts that sales will decrease approximately $24.79.
C. -2.25. So, during the 9th week, the model predicts that sales will increase approximately $2.25.
D. -24.79. So, during the 9th week, the model predicts that sales will increase approximately $24.79.
E. 0. So, during the 9th week, the model predicts that sales will remain constant.
Answer: A
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