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Equation representing relationship between ads and sale increase

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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 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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This solution helps with equations representing relationships between ads and sale increase.

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