Set 4: Trigonometry

Explanation

Answer: B

If $9x + 12 = 39$ , what is the value of $x$ ?

✓ Correct

Detailed Explanation

Choice B is correct. 1. Start: $9x + 12 = 39$ Subtract 12: $9x = 27$ Divide by 9: $x = 3$ Therefore, $x = 3$ .

Key Steps:

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Apply the appropriate mathematical formula

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The correct answer is 3

Why others are wrong:

A: This would give an incorrect result. Choice A 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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