What is the combination of two or more waves, which is a result in a single wave?

Me find the measure to side a and the process to solve the problem you appreciate it : )

Write the sentence as an equation. 6 fewer than the quantity 140 times j equals 104

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!