Prove that if (a, b) and (c, d) are two distinct points, the line joining them is perpendicular to the line joining (b, c) and (d, a)

First, find the slopes of each line. This is (b-d)/(a-c) and (b-s)/(c-a). Since the product is -1, they are perpendicular.

answer: for each 3 girls there is 2 boys . 3: 2

hope this ! (:   mark me as brainliest if you can

b. 153 students do not participate in sports and seventy-five 12th graders were surveyed