How do you solve 30 inches increased by 30%

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).

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

Hi, can anyone show me how to do this problem? 100 points for this. in advance