The —— lets you add or multiply more than two numbers in groups of two in any order

Which of the following properties can be used to show

Based on the figures as marked, /\rqs = —

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!