Katrina's mother is 2 inches shorter than her father, Katrina is 2 inches shorter than her mother, and Katrina's brother is 2 inches shorter than Katrina. Which best represents the change in height from Katrina's father to her brother?

Each person in the sequence is 2 inches shorter than the person before: Katrina’s mother is 2 inches shorter than her father, Katrina is 2 inches shorter than her mother, and her brother is 2 inches shorter than Katrina. That is a total change of 2 + 2 + 2 = 6 inches shorter, or –6 inches. The correct choice is –6 inches.

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