please please please help on all three multiple choice questions

efficiency wariances, rentitet hanly, to tie: faveratile faveratile urfoverablec unfoyeratill. umfaverable, foverable Tavorable unfeyorable Which of the following may cause an unfavorable activity variance of sales reventies? Actual sales in dollars are less than the master budeet oles in dollars Actual sales in dollars are greater than the muster bucket sales in dollars The flexible budget sales in dollars are less than the master budiget sales in dollars The flexible budget sales in dollars are greater than the master budget sales in dollars. The flexible budget direct materials formula is calculated by: Standard quantity allowed for actual units produced X actual price for DM per unit Standard quantity allowed for actual units produced X standard price for DM per unit Actual quantity of materials used for actual units produced X standard price for DM per unit Actual quantity of materials used for actual units produced X actual price for DM per unit