In 2010, the population of the United States was about 3 x 10⁸. The land area of the United States is 9,191,966 square kilometers. In 1960, rhe land area was the same, but the population was 179,323,175. Part A: Use the expression for the approximation of the population in 2010 as a model to write approximation of the population of the United States in 1060 and the land are of the United States in square kilometers. Part B: Use your answer from Part A to estimate how many time as great the population of the United States was in 2010 as in 1960.Part C: Population density is the ratio of population to land area. Explain how to use your expression for the 2010 population from Part A to estimate the population density of the United States in 2010.