What can you multiply to get 10 and add to get seven

You have 6 dollars +12 pennies +to quarters + 4 dimes=2 nickels how much do you have

Sorry guys but as you have a small brain

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.