A12 -foot piece of string is cut into two pieces so that the longer piece is 3 feet longer than twice the shorter piece. find the lengths of both pieces.

Afitness center has 2 membership plans one has a low dollar sign up fee of 15 dollars and costs 38 dollars per month to join. a second plan has a higher sign up fee of 78 dollars but a lower monthly fee of 31 dollars for what number of days of the month is the coat the same