Which three side lengths best describe the triangle in the diagram? another easy questions that I cant answer <3

Iwill make brain if you me correctly fill this out needs due today pls and send it back to me (click the link and you will get it)

The table below represents the displacement of a fish from its reef as a function of time: time (hours) x displacement from reef (feet) y 0 4 1 64 2 124 3 184 4 244 part a: what is the y-intercept of the function, and what does this tell you about the fish? (4 points) part b: calculate the average rate of change of the function represented by the table between x = 1 to x = 3 hours, and tell what the average rate represents. (4 points) part c: what would be the domain of the function if the fish continued to swim at this rate until it traveled 724 feet from the reef? (2 points)

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?