3. the first car of the train, right behind the engine, contains 10 boxes. in each of the following
cars there are twice as many boxes as in the car in front of it.
how many boxes are there in the fifth car?
(a) 100
(b) 120
(c) 140
(d) 160
(e) 180

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality