Set 1: Trigonometry

Explanation

Answer: C

If $x = 9$ , what is the value of $5x + 15$ ?

✓ Correct

Detailed Explanation

Choice C is correct. 1. Substitute $x = 9$ $5(9) + 15$ $= 45 + 15$ $= 60$ Therefore, $5x + 15 = 60$ when $x = 9$ .

Key Steps:

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Apply the appropriate mathematical formula

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The correct answer is 60

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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