Help! This is worth over 20 points and I don't know what to do

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 expression is rational? 6. , square root two, square root 14, square root 49

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c