An increase from 30 to 31 in the second constraint increases the objective function in 6.67 units.

A decrease from 15 to 14 in the first constraint decreases the objective function in 16.67 units.

None of the other options are correct.

An increase from 8 to 9 in the third constraint increases the objective function in 16.67 units.

The dual problem is unbounded.

The dual problem reaches a degenerated solution.

The dual problem is infeasible.

None of the other options are correct.

The next entering variable is x₃, while the leaving variable is h₃.

The solution is degenerated, and the optimal will not be obtained ever.

None of the other options are correct.

The next entering variable is h₁, and the problem is unbounded.