Rory is staying in a cabin on a hill 300 feet above sea
level. She walks down the hill to the water's edge. The
equation of her average change in elevation over time
is e = 300 - 10t, where t is the time in minutes since
she left the cabin, and e is her elevation with regard to
sea level. Which values are viable points, and what are
their values in the table relating t and e?

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