Simplify where possible 3 (x+3)

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!

Which expression shows the sum of the polynomials with like terms grouped together

If y varies directly as x2 and y=6 when x=6, find the constant of variation.