Could anybody me with 3 of this questions

To describe a sequence of transformations that maps triangle abc onto triangle a"b"c", a student starts with a reflection over the x-axis. how should the student complete the sequence of transformations to map triangle abc onto triangle a"b"c"? plz

With finding limits of multi variable !

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?