PSAT Math Grid-Ins Question 140: Answer and Explanation
Question: 140
A botanist plants a small ivy plant and evaluates its growth function. She finds that 2 months after planting, the plant is 5 inches tall; at 4 months after planting, the plant is 8 inches tall. Additionally, the botanist has noticed that the plant has grown at a constant rate since its initial planting. Given this information, what was the plant's height in inches at the time it was planted?
Correct Answer: 2
Explanation:
2 The plant increases 3 inches in height every 2 months. Simply backtrack 2 months from the time when it is 5 inches tall in order to see how tall it was when it was planted:
5 - 3 = 2 inches
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