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Substitute x=4x=4: 2(42)−3(4)+1=2(16)−12+1=32−12+1=212(4^2) - 3(4) + 1 = 2(16) - 12 + 1 = 32 - 12 + 1 = 21. Wait — correction. That equals 21, not 27. Re-check the choices: option A is 21. So, correct answer is A. On HiSET, evaluation of functions requires careful substitution and order of operations.

Subject-verb agreement: singular “he” pairs with “doesn’t like.” Correct: B.

Distribute: 3x−12=213x - 12 = 21. Add 12: 3x=333x = 33. Divide: x=11x = 11. Correction: check again — wait. Actually: 3x−12=21⇒3x=33⇒x=113x - 12 = 21 \Rightarrow 3x = 33 \Rightarrow x = 11. So the correct solution is D (11). Substitution confirms: 3(11−4)=213(11 - 4) = 21. True.

Author’s purpose looks at what the writer intends to achieve—inform, persuade, entertain, or explain a process. The passage contrasts a fast-paced online culture with the benefits of “curating fewer, higher-quality posts,” which “may foster more meaningful conversations.” The language encourages a reconsideration of habits (“may foster”), suggesting a persuasive purpose: advocating for slower, more thoughtful sharing—choice C. Option A overstates; the passage does not call for banning social media. Option B is unsupported; there is no claim about virality rates. Option D is off-topic; nothing addresses algorithmic coding. On HiSET Reading, tone words (e.g., “rewards,” “yet,” “may foster”) and value-laden contrasts signal persuasion. The author acknowledges the norm (speed) but proposes a different approach (quality and depth), a classic persuasive structure. Therefore, C best captures the purpose.

“Mediocre” means average or ordinary, not especially good or bad. Context: “neither terrible nor great” confirms. Correct: B.