The questions from operation research

5. Which type of spreadsheet cell represents the left hand sides @HS) formulas in an LP model? Target or set cell Changing variable cell Constraint cell Constant cell 999'!\" 9' The constraint for resource 1 is 5 X1 + 4 X2 S 200. If X1 = 20 and X2 = 5, how much of resource 1 is unused? 0 80 100 200 999'?\" 7. How many constraints are there in a transportation problem which has 5 supply points and 4 demand points? (ignore the non-negativity constraints) a. 4 b. 5 c. 9 d. 20