PLEASE HURR The formula for a trapezoid relates the area A, the two bases, a and b, and the height, h.

A=12h(a+b)

Solve for h.

h=A2(a+b)

h=2(a+b)A

h=a+b2A

h=2Aa+b

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?