Azap will mark as brainliest

which expressions are polynomials?

select each correct answer.

a. x^2+5x^1/5

b.6x² + 5x

c.−x^2+5x

d.−7x^2+5/3x

Afitness center has 2 membership plans one has a low dollar sign up fee of 15 dollars and costs 38 dollars per month to join. a second plan has a higher sign up fee of 78 dollars but a lower monthly fee of 31 dollars for what number of days of the month is the coat the same