What is constant of proportionality x/y=2/9

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

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