Set 14: Linear Functions (Intermediate)

Explanation

Answer: A

A candle is 10 inches tall. After 2 hours, it is 8 inches tall. What is the burn rate?

$1$ inch per hour

✓ Correct

$2$ inches per hour

$0.5$ inches per hour

$4$ inches per hour

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Calculate slope magnitude. 1. Change in Height: $8- 10 = -2$ inches. 2. Change in Time: 2 hours. 3. Rate: $-2 / 2 = -1$ inch/hr. 4. Magnitude: 1 inch per hour. Strategic Tip: Rate is usually expressed as a positive number in speech ("burns at 1 inch/hr"), but the slope is negative. Choice B is incorrect. Choice C is incorrect. Choice D is incorrect.

Key Steps:

•

The correct answer is $1$ inch per hour

Why others are wrong:

B: Choice B is incorrect and may result from a calculation error.

C: Choice C is incorrect and may result from a calculation error.

D: Choice D is incorrect and may result from a calculation error.

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