Correct answers only ! i cannot retake which graph represents f(x) = 12x^2?

What is the length of an with endpoints a 3,2 and b 8,14

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

This is different from the first one can someone me