Rewrite 2/3 : 1/15 as a unit rate

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Use the formulas a = x 2 – y 2, b = 2xy, c = x 2 + y 2 to answer this question. one leg of a right triangle has length 11 and all sides are whole numbers. find the lengths of the other two sides. the other leg = a0 and the hypotenuse = a1

How much would it be worth in 5, 10, 20 years