Giselle brought a dress for $35 and three t-shirts she used a coupon for $2.50 off each t-shirt The total cost can be modeled by the expression 35+3(n-2.5) what does n-2.5 represent?

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?