Plz hurry and help! I need the answer to all three questions!

What is the solution set of the quadratic inequality x^2-5< or equal to 0

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

4+(2+x) can you me solve this problem