
Concept explainers
Rising Sea Level Marjory Duffin recently purchased a beachfront condominium in New York and is now in a panic, having just seen some disturbing figures about rising sea levels (sea levels as measured in New York relative to the 1900 level).
Year Since 1900 | 0 | 25 | 50 | 75 | 100 | 125 |
Sea Level (mm) | 0 | 60 | 140 | 240 | 310 | 390 |
a. What was the average rate of increase of the sea level over this entire period?
b. During which 25-year interval(s) did the rate of increase of the sea level exceed the average rate?
c. Marjory Duffin’s condominium is about 2 meters above sea level. Using the average rate of change from part (a), estimate how long she has before the sea rises to her condominium.

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