Mission statement, standard costing, fixed and flexible budget

Hi Sir,

Could you please help me to answer the following questions as I can’t find there answers any where.

Which of the following about mission statements are true?
(1) They are stated in a standard format
(2) They play an important role in the planning process
(3) They help ensure consistency in decision making

Which of the following statements about standard costing are true?
(1) A standard cost is a predetermined estimated unit cost
(2) A standard cost can be used as a control device to help improve performance
(3) A standard cost card shows the unit cost details only of each product

(i) 1 and 3 only
(ii) 2 and 3 only
(iii) 1 and 2 only
(iv) 1 2 and 3

Which TWO of the following statements about fixed and flexible budgets are true?
(i) Fixed budgets are useful for monitoring fixed costs
(ii)Comparison of a fixed budget with the actual results is useful for budgetary control purposes
(iii) Flexible budgets are prepared using marginal costing techniques
(iv) Flexible budgeting assumes that most costs are semi-variable