Which does not represent a linear function?​

Use set buikder notation to represent the following set: {, -2, -1, 0}

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.

What is the radical expression that is equivalent to the expression 27 1 over 5?