Write a rule for the function​

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!

Find two consexutive odd integers such that the sum of their square is 650

Can someone show me step by step how to do this?