9
algebra

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

A

11 inch per hour

B

22 inches per hour

C

0.50.5 inches per hour

D

44 inches per hour

Correct Answer: A

Choice A is the correct answer. Calculate slope magnitude.

  1. Change in Height: 8−10=−28 - 10 = -2 inches.
  2. Change in Time: 2 hours.
  3. Rate: −2/2=−1-2 / 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.

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Linear Functions Set 96