<4 and <5 form a linear pair and m<4 = 62. Find m<5.
Well, just use what you know.
You know that a linear pair of angles are supplementary, adding up to 180 deg.
So, if m<4 + m<5 = 180
m<4 = 62, what does that leave left for m<5?
Presumably if you are taking geometry, you passed algebra I