C = 0.25 (L-1200) The cost, C, in dollars, to the holder of a liability insurance account given a total liability of L dollars is given by the equation above as long as C is positive. By how many dollars does the liability increase when the cost to the holder increases by 1 dollar?

please explain the process, the khan academy one is confusing ​

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