2. Mr. Lavi determined that the total cost of his son's birthday party, c, could be represented by the equation c = 20n + 300, where "n" is the number of people attending the party. If his
son's birthday cost $1120, how many people attended the birthday party?

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