Set 4: Trigonometry

Explanation

Answer: D

Solve for $x$ : $6(x + 7) = 78$

✓ Correct

Detailed Explanation

Choice D is correct. 1. Start: $6(x + 7) = 78$ Divide by 6: $x + 7 = 13$ Subtract 7: $x = 6$ Therefore, $x = 6$ .

Key Steps:

•

Apply the appropriate mathematical formula

•

The correct answer is 6

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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