
Concept explainers
Advertising Costs OHaganBooks.com has (on further advice from Marjory Duffin) mounted an aggressive online marketing strategy. The following graph shows the weekly cost of this campaign for the 6-week period since the start of July (t is time in weeks):
a. Assuming that the trend shown in the graph continues indefinitely, estimate
and
b. Estimate

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Applied Calculus
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