1.In what percent of the arrangements are the vehicles separated by an empty parking space? 2.In what percent of the arrangements are the vehicles parked next to each other?

3.In what percent of the arrangements does the left or right parking space remain vacant?

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?