The jones family walks along a trail going uphill, then follows the same path downhill. the graph y= f(x) depicts the elevation along the trail for the roundtrail.

1. identify and interprets of the graph of f
2. identify and interpret interval(s) in which the graph f is increasing

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