What to do after step?

please help! just a step

And explain how you got it so i can understand future problems : 3

Awoman has 14 different shirts: 10 white shirts and 4 red shirts. if she randomly chooses 2 shirts to take with her on vacation, then what is the probability that she will choose two white shirts? show your answer in fraction and percent, round to the nearest whole percent.

Segment wx is shown explain how you would construct a perpendicular bisector of wx using a compass and a straightedge