(Solved): Joanne selis silk-screened T-shirts at community festivals and craft fairs. Her marginal cost to pr ...

Joanne selis silk-screened T-shirts at community festivals and craft fairs. Her marginal cost to produce one T-shirt is \$4.50. Her total cost to produce 80 T-shirts is \( \$ 430 \), and she sells them for \( \$ 9 \) each. a. Find the linear cost function for Joanne's T-shirt production. b. How many T-shirts must she produce and sell in order to break even? c. How many. T-shirts must she produce and sell to make a profit of \( \$ 800 \) ? a. The linear cost function is \( C(x)=4.5 x+9 \).