Abag contains 120 marbles. some are red and the rest are black. there are 19 red marbles for every black marble. how many red marbles are in the bag?

Which lines are parallel? justify your answer. lines p and q are parallel because same side interior angles are congruent. lines p and q are parallel because alternate exterior angles are congruent lines l and m are parallel because same side interior angles are supplementary lines l and m are parallel because alternate interior angles are supplementary.