i need help with 1-4

1) If activity is higher than expected, total fixed costs should be higher than expected. If activity is lower than expected, total fixed costs should be lower than expected. 2) Comparing a static planning budget to actual costs is not a good way to assess whether variable costs are under control. 3) In a flexible budget, when the activity declines, the total variable cost also declines. 4) The main difference between a flexible budget and a static budget is that the static budget is not adjusted for changes in the level of activity