Twenty people get into an elevator in a hotel with seven floors, and all of them get off at some point. how many different possibilities exist for how the people could get off the elevator? (you can treat the people as indistinguishable for this problem, i. e., for example, if two people get off on the 4th floor, we don’t care which two people they are.)

140

Step-by-step explanation:

you multiply the amount of people by the amount of floors, 7x20=140

when rotating a figure 180 degrees, imagine that you are able to take the figure and turn it clockwise or counterclockwise around a center point. to rotate a figure 180 degrees, you will need to apply the rule (x, y) → (-x, -y). start by using a coordinate grid with coordinates for each vertex of the figure. the center point of the coordinate grid is located at (0, 0), which is what you will rotate the figure around. write down the original coordinates of the shape you are going to rotate. then, apply the rule. for example, coordinate (1, 2) becomes (-1, -2). another example would be, coordinate (-4, -2) becoming (4, 2). after you change each original coordinate to the rotated coordinate, you will draw your new figure.

step-by-step explanation: