If constraints are added to an LP model the feasible solution space will generally

		decrease.
		increase.
		remain the same.
		become more feasible.

In a mathematical formulation of an optimization problem, the objective function is written as z=2x1+3x2. Then:

		x1 is a decision variable
		x2 is a parameter
		z needs to be maximized
		2 is a first decision variable level

Which of the following categories of modeling techniques involves determining the value of a dependent variable based on specific values of independent variables?

		Biased models.
		Descriptive models.
		Predictive models.
		Prescriptive models.