Calculate the mean, median, and mode of each graph

What does it mean by solve the exponential equation for x?

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.

Hi, can anyone show me how to do this problem? 100 points for this. in advance