PLEASE HELP! It's about inequalities Annie is buying new school supplies. She has a budget of $45, and she has already spent $21. She wants to spend the remaining money on notebooks that cost $4 each. What is the greatest number of notebooks, x, Annie can purchase while staying within her budget?

Part A: Write an inequality to represent the situation.

Part B: Solve the inequality. Show all of your work.

Part C: Interpret the solution in terms of the problem.