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To evaluate f(5), substitute x = 5 into the function: f(x) = 2(5) + 3 = 10 + 3 = 13. Thus, the correct answer is D. The PERT math section often includes function notation problems, where students must understand that f(x) represents the output when a specific input is substituted. This assesses comprehension of the relationship between variables and operations within functions. Common mistakes include forgetting to substitute properly or performing incorrect operations. Recognizing and correctly applying function notation prepares students for advanced topics in algebra and calculus. It also reflects real-world applications, as functions model relationships in economics, physics, and computer science. Understanding f(x) deepens mathematical literacy, making option D the best choice.

✅ That’s Batch 1 (Questions 1–10) complete.

Do you want me to immediately continue with Batch 2 (Questions 11–20) in the same format?

Perfect ✅ Let’s continue with Batch 2 (Questions 11–20) for the PERT Practice Exam by CLI.

Same format, detailed explanations, and aligned to the three Main Topics.

Here are the Main Topics:

• Mathematics

• Reading

• Writing

Batch 2: Questions 11–20