Can somebody answers this you , just a, b, and c .

a) ( -8 ) - 13 - ( -4 )

b) 4 - ( -7 ) + ( -2 )

c)( -7 )+ 3 - 20

i would really appreciate answers you .

Ineed in figuring out this problem.

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

1jessica's home town is a mid-sized city experiencing a decline in population. the following graph models the estimated population if the decline continues at the same rate. select the most appropriate unit for the measure of time that the graph represents. a. years b. hours c. days d. weeks