PSAT Math Multiple-Choice Question 745: Answer and Explanation

Question: 745

Given that the function increases at the same geometric rate as it does in weeks 9–12, what would most likely come closest to the number of new investment pledges in week 14?

• A. 450
• B. 650
• C. 800
• D. 1,000

Correct Answer: A

Explanation:

(A) "Geometric" is synonymous with "exponential." Estimate the approximate increase given the rate of exponential growth and starting point at week 12. Fortunately, the answers are far enough apart that 450 is the only reasonable option. The other options all represent far too large an increase.