Simplify x^8 divided by x^4 • x^2

Can someone me with my hwplz(only the circled ones)

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

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!