What is the following product? ^3Vx^2•^4VX^3

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

Need solving this second acceleration problem.

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!