50 POINTS in how many ways can you select 3 books to bring on vacation from a group of 11 books

Geometry answer picture question pls . reason and statements

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?

Predict which statements are true about the intervals of the continuous function. check all that apply