HELPP 100 points. Which expression is equivalent

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

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

Sum is 17 and their difference is 3