First, what happens to the slope of the objective function when one of its parameter coefficients changes? If a parameter coefficient in the objective function changes too much in one direction, then elaborate upon whether it is possible for a new "corner point" to become relevant. In this case, the feasibility region doesn't change a bit. What happens to the feasible region when the amount of a particular resource increases? When this happens, what are the implications for the optimal values of the decision variables and the objective function?