20 people show up to a post-pstat 120a party. if everyone shakes hands with everyone else, how many handshakes take place

What is a rational number between 9.5 and 9.7

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

Negative 5 1/12 + negative 4 1/4 + 6 3/4