( please help ) Before your trip to the mountains, your gas tank was 7/9 full. When you returned home, the gas gauge registered 1/3 of a tank. if your gas tank holds 18 gallons, how many gallons did you use to drive to the mountains and back home?

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