... function at a particular point and just what we mean by“nearby” are very important ones, and we will examine them more closely in chapters to come. First, let’s look back at Examples 4. 1 and 4. 2.In ... fields of finance and economics.Investors lay billions of dollars on the line when they use economic data to project into thefuture. The question of exactly how far into the future one can, within ... the course of the next four days, shespent a total of $72 on food, lodging, transportation, museum entry fees, and baksheesh(tips). She is going to the bank to change enough money to last for...