false

False. 

In a feasible basic solution for a linear programming problem, it's not necessary for all the variables (except the objective) to be positive. A feasible basic solution is a specific assignment of values to the decision variables that satisfies both the constraints and the requirement that the number of non-zero variables is equal to the number of constraints.

False. It can possibly be 0

false

false

false they can be also zero

false

false

False

False

False