Regina smith earned $84 in simple interest in 8 months at an annual interest rate of 3%. how much was her initial investment? (hint: use the formula i = prt and substitute known values to find i.)
so i got p*(0.03*8/12) = 84 and can't find p pls

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

What is the result of adding the system of equations? 2x+y=4 3x-y=6

Im so bad at fractions they are not my best math thing to work on