How to factorize 5x^2-20y^2

Use the distributive law to multiply. 3(4x + 5y + 6)

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

Which number completes the inequality? 2/3 < _ < 7/9