30 pts! solve the following equation. (x - 18)^2 = 1
a. x= 19 and x=17
b. x = -19 and x= -17
c. x=-19 and x= 17
d. x= 19 and x= -17

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?