I need help please and thanks

Need on this geometry question. explain how you did it.

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

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.