Please help whats the inverse function

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

Beth took out a $20,000 loan for college she is borrowing money from two banks. bank a charges an interest rate of 8.5% bank b charges and interest rate of 10.5% after one year alice owes $1860 in interest how much money did she borrow from bank a

Ron has 8 caps and 4 of his caps are blue. thes rest of his cap are red. how many of ron's caps are red