Set 1: Trigonometry

Explanation

Answer: D

If $x = 2$ , what is the value of $6x + 9$ ?

✓ Correct

Detailed Explanation

Choice D is correct. 1. Substitute $x = 2$ $6(2) + 9$ $= 12 + 9$ $= 21$ Therefore, $6x + 9 = 21$ when $x = 2$ .

Key Steps:

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Apply the appropriate mathematical formula

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The correct answer is 21

Why others are wrong:

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

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.

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