Cathy needs to collect linear data. which set of data should cathy collect? a) the height of a building for twenty years b) the height of a person from birth to age twenty c) the height of a tree for twenty years from the time it was planted d) the height of an elephant for twenty years from the time it was born

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