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.
Since most major league games average between 250 and 300 pitches, that would put the ball count at about 40 or 50 balls used per game. According to the MLB: between five and six dozen baseballs are used during each baseball game, as many as 72 balls.. Each ball costs about $3-dollars, so that works out to $216-dollars worth of balls for each baseball game.