The population of a certain country was approximately 25 million in 1900, 175 million in 1950, and 350 million in 2000. Construct a model for this data by finding a quadratic equation whose graph:
a) intersects the x-axis at 25 million, 175 million, and 350 million.
b) is a straight line.
c) is a cubic equation.
d) fits the data points given.
