Add the following polynomials, then place the answer in the proper location on the grid. 2x3 - 4x2 + 6x - 3 x3+6x2 - 8x + 12
- 3x3 + 2x2 - 4x - 7

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