Explain how to check a quatient from a division problem

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

Aline that intersects one of two parallel lines intersects the other also always sometimes never

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"