18. which of the following is a composite number?
oa. 19
ob. o
c.1
od. 63

With math question will mark brainliest question in the pic.

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.

Yo need asap pls ! markin da brainiest too !