What is the value of x ? in ∆abc, m∠a=(3x + 7)°, m∠b = (2x − 8)°, and m∠c=(5 − x)° a.29 b.40 c.46 d.44

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?