List the first twenty counting numbers in the indicated base below. twelvetwelve (Only digits 0 comma 1 comma 2 comma ... comma 9 comma Upper A comma Upper B0, 1, 2, ..., 9, A, B are used in base twelvetwelve.)

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