. Doreen bought a cell phone for x dollars. One year later the value of the phone was 0.75x. Which expression is another way to describe the value of the phone? a) 0.25% decrease b) 0.75% decrease c) 25% decrease d) 75% decrease​

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?