Pls answer, and be clear on which one your answering, very worth 30 : ) < 333

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?

What is the approximate mark up percentage rate before m equals $1740 marked up from p equals $19,422

Acheetah can run 70 per hour. what is the speed in feet per hour