Felipe is saving money for a class trip. He already has saved \$250$250dollar sign, 250 that he will put toward the trip. To save more money for the trip, Felipe gets a job where each month he can add \$350$350dollar sign, 350 to his savings for the trip. Let mmm be the number of months that Felipe has worked at his new job. If Felipe needs to save \$2700$2700dollar sign, 2700 to go on the trip, which equation best models the situation?