Please help! Will give 50 points for this Trig question

How do you divide 9/4 divided by 10/3

What's the difference between: x≥0 and nonnegative integer. ?

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.