How do you know if an expression is a polynomial, i am completely clueless

In mathematics, a polynomial is an expression consisting of variables (also called indeterminates) and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer exponents of variables. An example of a polynomial of a single indeterminate, x, is x2 − 4x + 7.

Get 40 cups.u would say since the bowl and cups must be equal it would be 40