Can u help me I’m not getting it

Which statement best describes the polynomial

Which function is odd check all that apply a. y=sin x b. y=csc x c. y=cot x d. y=sec x

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.