Set 4: Trigonometry

Explanation

Answer: D

If $x = 10$ , what is the value of $4x + 9$ ?

✓ Correct

Detailed Explanation

Choice D is correct. 1. Substitute $x = 10$ $4(10) + 9$ $= 40 + 9$ $= 49$ Therefore, $4x + 9 = 49$ when $x = 10$ .

Key Steps:

•

Apply the appropriate mathematical formula

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The correct answer is 49

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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