Rachel is selling t-shirts. it costs her $5 each week to advertise her t-shirts. she buys each t-shirt for $3.50 and sells each one for $8.00. write an equation to model the amount of profit, p, she makes from selling x t-shirts in one week. p = 3.50x − 5 p = 8x − 3.5 p = 5x + 3.5 p = 4.5x − 5