It is almost the end of the grading period. i have 730 out of 880 points so far in my math class which means i currently have a b (83%). there are 90 points remaining before grades come out. my teacher round each student's scores to the nearest percent. what is the few esta number of points i need to get & end up with the grade of c (at least 70%), b (at least 80%), a (at least 90%)

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?