which of the following could represent the side lengths of a triangle? check all that apply. A) 4ft, 7ft, 8ft B) 4in, 4in, 8in, C) 20m, 15m, 12m D) 13mm, 7mm, 9mm E) 6cm, 3cm, 8cm

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?