Is 2^ 2019 -1 a prime number?

Given right triangle xyz, which correctly describes the locations of the sides in relation to

What are the soultion(s) to the quadratic equation 40- x^2=0

The diagonals of a quadrilaretral intersect at (-1,4). one of the sides of the quadrilateral is bounded by (2,7) and (-3,5) determine the coordinates of the other side in order for the quadrilaretral to be a square.