Which one is the right answer?

B

Step-by-step explanation:

A monomial is a single number or a number multiplied by one or more variables. A sum of monomials is a polynomial.

Since the only thing you can do with variables in a monomial is multiply them by other variables or by numbers, you cannot have a variable in the denominator or a variable in a square root.

Choices A, C, and D have either a variable in a denominator or in a root. That means they are not polynomials.

B

step-by-step explanation:

use pothagarean therom

a^2+b^2=c^2 so first ac

acm is a right triangle because c= 90°

and am (the hypotenuse or c) =16+9 =25

but there is not enough info we need another angle or side length