For the following exercise, construct a function modeling behavior and use a calculator to find desired results.
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For the following exercise, construct a function modeling behavior and use a calculator to find desired results.
A city’s average yearly rainfall is currently 20 inches and varies seasonally by 5 inches. Due to unforeseen circumstances, rainfall appears to be decreasing by 15% each year. How many years from now would we expect rainfall to initially reach 0 inches? Note, the model is invalid once it predicts negative rainfall, so choose the first point at which it goes below 0.
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