Idk sooo please help

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

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

What is r i 4.5+10r=-6.5 with work pls