Question

Which expression shows a sum of three terms?

3x
3 + x
x3
x + 3 + x

Answer 1

x+3+x

Explanation:

Answer 2

x + 3 + x

Explanation:

The sum of three terms means that three terms have been added.

3x is the answer; it does not show the terms being added.

3+x is the sum of two terms.

x³ is a product.

x+3+x shows 3 things being added, so it is the correct answer.