ik I'm annoying but please I'm almost finished! just do these two and whoever answers correctly will get brainliest

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

What is not true about kl and mn? what is mn? (show )

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