A box contains 100 balls, of which r are red, with r < 100. Suppose that the balls are drawn from the box one at a time, at random, without replacement. Determine the probability that the first ball is drawn will be red.

Graph a triangle (xyz) and reflect it over the line y=x to create triangle x’y’z’. describe the transformation using words. draw a line segment from point x to the reflecting line, and then draw a line segment from point x’ to the reflecting line. what do you notice about the two line segments you drew? do you think you would see the same characteristics if you drew the line segment connecting y with the reflecting line and then y’ with the reflecting line? how do you know?