HELP ASAP IT'S AN EMERGENCY

The final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?

Solve the problem. a student earned grades of c, a, b, and a in four different courses. those courses had these corresponding numbers of credit hours: 4, 5, 1, and 5. the grading system assigns quality points to letter grades as follows: a = 4, b = 3, c = 2, d = 1, and f = 0. compute the grade point average (gpa) and round the result to two decimal places. 3.40 3.50 8.75 2.18

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15