Which algebraic expression are polynomials? Check all that apply

Acompany is testing in comparing to lightbulb designs the box plot shows the number of hours that each lightbulb design last before burning out which statement is best supported by the information of the plot

Which rational number could be graphed between -4 and -5

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.