What do the following two equations represent?
y - 2 = x + 20
y - 2 = -(x+20)

In the image, point a marks the center of the circle. which two lengths must form a ratio of 1 : 2? (options are in the images since thought they were harmful phrases)

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

What is the value of the discrimination for the quadratic equation 0=×2+2+×2