World Population One projection of the world population by the United Nations for selected years (a low-projection scenario) is given in the table below.
Year | Projected Population (millions) | Year | Projected Population (millions) |
1995 | 5666 | 2075 | 6402 |
2000 | 6028 | 2100 | 5153 |
2025 | 7275 | 2125 | 4074 |
2050 | 7343 | 2150 | 3236 |
a. Find a quadratic function that fits the data, using the number of years after 1990 as the input.
b. Find the positive x-intercept of this graph, to the nearest year.
c. When can we be certain that this model no longer applies?
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