Help asappp please ‼️‼️‼️‼️‼️

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.

Find the area of an equilateral triangle with a side of 6 inches

Tatiana reads 40 pages of her book every night for x number of nights. write an expression that shows the number of pages she has read