Help please please please please​

Which of the following is correct interpretation of the expression -4+13

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 are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2