You have to do 21+8+11=40. So 40 is the answer. Hope this helps.
There are two (2) terms, "2x" and "8", making it a "binomial" (the "bi" prefix meaning "two"). The only variable is x, and its power is 1, making the "2x" term a first-degree term. Since the highest degree of any term is 1, the polynomial is first degree.
Selection A is appropriate.
