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1.

 The object function is a mathematical expression for what we are trying to accomplish. This expression will always start with either "maximize" or "minimize" and be followed by a linear expression in terms of the variables. The objective function takes the following form:

where the coefficient (Coef.) is a real number and it is followed by the variable name (Var.). For example, let's say we are producing three products, call them p1, p2, and p3, and they sell for $2, $3, and $8 respectively. If our goal is to maximize our revenues, then our objective function would be: