At a pizza eating competition, davonne at four more than twice as many slices at the runner-up. if davonne at 11 slices, then how many slices did the runner up eat?

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.