Explanation
Correct answer: A.
Choice A is correct. It's given that a student's essay needs to have no more than words. It’s also given that the student’s essay already has words. Let represent the number of additional words the student includes in the essay. After including additional words, the essay will have a total of words. Since the essay needs to have no more than words, it follows that . Subtracting from both sides of this inequality yields . Thus, the maximum number of additional words the student can include in the essay is .
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Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice B
Choice B is incorrect. This is the number of words already in the student's essay, rather than the maximum number of additional words the student can include.
Choice C
Choice C is incorrect. This is the total number of words the essay can contain, rather than the maximum number of additional words the student can include.
Choice D
Choice D is incorrect. This is the number of words the essay would contain if the student added more words, rather than the maximum number of additional words the student can include.