Mathematics, 21.11.2019 02:31, kdlishs

The total revenue r (in dollars) is directly proportional to the number of units sold x. when 25 units are sold, the total revenue is $300. write a mathematical model that relates the total revenue r to the number of units sold x.

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The total revenue r (in dollars) is directly proportional to the number of units sold x. when 25 uni...