Joanne sells sik-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 60 T-shifts is $320, and she sells them for $9 each. a. Find the linear cost function for Joanne's T-shit 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 seli to make a profit of $700 ? a. The linear cost function is C(x)= b. Joanne must produce and soll T-shirts in ordec to break even, because the number of T-shirts must be a whele number. c. Joanne must produce and sell T-shirts to make a profit of $700, because the number of T-shirts must be a whole number