Hello again I am hear to answer the questions i have been asked. i have been doing many investigations on the computer. To answer the first question if I decrease the leg the hypotenuse also decreases. This is the answer to the next question.
leg 1 leg 2 hypotenuse
9 9 12.728
9 8 12.042 12.728-12.042=.686
9 7 11.402
9 6 10.817 11.402-10.817=.585
9 5 10.296
9 4 9.849 10.296-9.849=.447
9 3 9.487
9 2 9.22 9.487-9.22=.267
9 1 9.005

As you can see the change that the numbers go through is not the same. Lastly I can not make predictions on what the lengths will be. i was also asked to make up my own question and investigate it. the question is if the numbers 9,18, 27. I did a investigation on the second site that my teacher sent me and i found out that those numbers do not work.