By definition of supplementary angles, m<1 + m<2 = (a) and m<2 + m<3 = (b). then, m<1 + m<2 = m<2 by the (c). subtract m<2 from each side. you get m<1 = (d), or <1 = (e).

Aschool allots ? 1500 to spend on a trip to the theatre. theatre tickets have a regular cost of ? 55 each and are on offer for 1 5 off. a train ticket for the day will cost ? 12 each. if 2 teachers and the maximum number of students attend, how much money will the school have left over?