A. m<1 = m<4 and m<2 = m<5 because of the alternate interior angles theorem.
The Alternate Interior Angles theorem states, if two parallel lines are cut by a transversal, then the pairs of alternate interior angles are congruent, added a picture for visual demonstration.
B. m<4 + m<3 + m<5 = 180 degrees because they do a complete rotation, from one side of the straight line to the other, added a picture for visual demonstration.