How do you change an improper to a mixed numeral

Which equation can be simplified to find the inverse of y = 2x2?

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?