Six people come to a party and shake hands with each other. if each person shakes the hand of every other person, how many handshakes occur

Which of the following are accepted without proof in a logical system? check all that apply.

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective