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Sally has been running the following number of ads in the local newspaper to help attract customers into her store. She has also been keeping track

Sally has been running the following number of ads in the local newspaper to help attract customers into her store. She has also been keeping track of customers who have come into the store as a result of the ads, as well as the amount of money they spend.
This is the data from the last 4 weeks:
Number of Ads:          Increased Sales:
16                              330
12                              270
18                              380
14                              300
5) Determine the equation that relates ads and increased sales.
Thanks for your help!!

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