At a chairity basketball game, 450 tickets were sold to students at a school. the remaining x tickets were sold to the public. the prices of the two types of tickets are shown. when all the tickets were sold $10,500 was collected. how many tickets were sold to the public?

(student cost $15)
(public cost $25)

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