In 2006, Jenny began selling magazines. The company sold Jenny a beginning packet for $250.00. Jenny's cost for each magazine is 10% of the sales price.
1. Find the linear model for Jenny's cost as a functin of the dollar volume of magazines sold.
2. Find the linear model of Jenny's revenue as a function of the dollar volume of magazines sold.
3. Find the linear model for Jenny's profit as a function of the dollar volume of magazines sold.
4. How many dollars of magazines must Jenny sell before she begins to make a profit?