Hello whoever is reading this. I would like to have some help if u don’t mind. Thank you Btw it is number 3

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.

Select all the expressions that will include a remainder.

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length