1. The three assumptions necessary for a linear programming model to be appropriate are proportionality, additivity, and divisibility. Proportionality means that the contribution to the objective function and the amount of resources used in each constraint are proportional to the value of each decision variable. Additivity means that the value of the objective function and the total resources used can be found by summing the objective function contribution and the resources used for all decision variables. Divisibility means that the decision variables are continuous. The divisibility assumption plus the nonnegativity constraints mean that decision variables can take on any value greater than or equal to zero.
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