Set 2: Trigonometry

Explanation

Answer: C

If $2x + 13 = 21$ , what is the value of $x$ ?

✓ Correct

Detailed Explanation

Choice C is correct. 1. Start: $2x + 13 = 21$ Subtract 13: $2x = 8$ Divide by 2: $x = 4$ Therefore, $x = 4$ .

Key Steps:

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Apply the appropriate mathematical formula

•

The correct answer is 4

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.

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

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