Can someone help me with some of these math questions? I will really appreciate it. 1.) Solve for x

2.) Solve for x

3. Find the value of x

4.) What are the coordinates of the endpoints of the midsegment for △DEF that is parallel to EF?

5.) Find the measure of angle A

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