Use a calculator with a key or a A key to solve the following. The exponential function f(x) = 560(1.032)* models the population of a country, f(x), in millions, x years after 1974. Complete parts (a)-(e). a. Substitute 0 for x and, without using a calculator, find the country's population in 1974. The country's population in 1974 was 560 million. b. Substitute 22 for x and use your calculator to find the country's population, to the nearest million, in the year 1996 as modeled by this function. The country's population in 1996 was million.