Pearson, as an active contributor to the biology learning community, is pleased to provide free access to the Classic edition of The Biology Place to all educators and their students. The purpose of the activities is to help you review material you have already studied in class or have read in your text.
In modern day baseball, teams generally have five starting pitchers, and they take it in turn to start a game every fifth day (hence the phrase rotation). Sometimes, if the schedule pans out, a team can get away with a four man rotation, and in the distant past some teams managed a three man rotation.
According to NBC's Ask Liz column, MLB says an average of 65 balls are used per game. There are 30 teams playing each other in 162 games each. So there are (15 x 162 = 2,430) games per season, (you have to divide the total number of teams by two...