Set 4: Trigonometry

Explanation

Answer: A

If $x = 3$ , what is the value of $3x + 12$ ?

✓ Correct

Detailed Explanation

Choice A is correct. 1. Substitute $x = 3$ $3(3) + 12$ $= 9 + 12$ $= 21$ Therefore, $3x + 12 = 21$ when $x = 3$ .

Key Steps:

•

Apply the appropriate mathematical formula

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The correct answer is 21

Why others are wrong:

B: This would give an incorrect result. Choice B is incorrect and may result from a calculation error.

C: This would give an incorrect result. Choice C is incorrect and may result from a calculation error.

D: This would give an incorrect result. Choice D is incorrect and may result from a calculation error.

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