Find the sum: (2x2 + x + 3) + (3x2 + 2x + 1). a. 6x4 + 2x + 3 b. 5x4 + 2x + 4 c. 3x2 + 5x + 4 d. 5x2 + 3x + 4

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