20 FREE POINTS, spread the kindness around and make as many of these as you can

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 adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top

Which equation represents h for right triangle abc