See screenshot Please! :) and help ASAP thank youu!! <33

Add or subtract polynomial : –12qr? +13rq?

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.

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?