Can someone pls help with this

The product of two negative rational numbers is always zero sometimes zero never zero

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 number line represents the solution set for the inequality -1/2 greater than or equal to 4