How does a reflection across the y-axis change the coordinates of a shape?

Based on what i know about mean, this doesn't add up.

Which shows the correct lengths of side c in both scales? scale 1: 45 m; scale 2: 60 m scale 1: 60 m; scale 2: 45 m scale 1: 36 m; scale 2: 27 m scale 1: 27 m; scale 2: 36 m mark this and return save and exit

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55