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Mr. Franklin uses the formula A=-10m^2+60m+300 to predict how the amount an average customer spends at her store will change over time, where A is the amount in

where A is  the amount in $, and m is the the number of the months after the customer's initial purchase.  1. What is the maximum the average customer will spend according to this model and after how many months will it occur?  I got 390 in 3 month? could that be right? Also The model predicts that the amount the average customer spends will eventually fall to $0.00. after how many months is this predicted to happen? i got 9.25 month but am not sure that is right. thank you so much
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