a. m<5=40° (Given)
b. m<2=140° (Given)
c. <5 and <2 are supplementary angles
Because they add 180°: <5+<2=40°+140°=180°
d. <5 and <2 are same-side interior angles
You can see it in the graph
e. a // b
Because they are same-side interior angles and they are supplementary angles, the lines a and b must me parallels.