Which graph shows a function whose inverse is also a function?

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.

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

Hurry which expression is equivalent to 3√x^5y?