Four polynomials are shown below:
a. 3 − 7x5 + x2
b. 5x3 + 5 − 3x
c. 3x + 2x3 − x2 + 6 + 2x
d. 3x3 − 5 + 2x5 + x + 2x2
which of the above polynomials is a 5th degree trinomial? (1 point)
polynomial a polynomial b polynomial c polynomial d

The degree of a polynomial is the value of the highest exponent a variable is raised to (i.e., the degree of the equation is 2, since the highest exponent of a variable is 2. 

If we apply this concept to your list of polynomials, we see that polynomial A and polynomial D both have terms, so they are both fifth-degree polynomials. However, your answer must also be a trinomial (a polynomial with three terms.) If we look at polynomials A and D, we see that only polynomial A has three terms, so that must be the answer!

Let me know if you have any questions :)