What is algebra expression​

Use the graph to determine the range. which notations accurately represent the range? check all that apply. (–∞, 2) u (2, ∞) (–∞, –2) u (–2, ∞) {y|y ∈ r, y ≠ –2} {y|y ∈ r, y ≠ 2} y < 2 or y > 2 y < –2 or y > –2

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

What are “like terms”? why can we only add like terms?