Juan and his wife are each starting a saving plan. Juan will initially set aside $250 and then add $135 every month to the savings. The amount (in dollars) saved this way is given by the function , where is the number of months he has been saving. His wife will not set an initial amount aside but will add to the savings every month. The amount (in dollars) saved using this plan is given by the function . Let be total amount (in dollars) saved using both plans combined. Write an equation relating to . Simplify your answer as much as possible.