I need a bit of help:)

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

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!

32a³b² 8ab² simplify the following expression.