Joseph kitavich wants to determine his average phone bill so he is better able to budget his expenses. in october, november, and december his bills were $89.87, $45.67, and $34.56, respectively. what is the average monthly expense?

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?