Based on data from 1920 and projected to 2050 the expected life span of people in Country A can be described by the function f x 10 963 14 319 Inx where x is the number of years from 1900 to the person s birth year a Estimate the birth year for which the expected life span is 75 years b Use graphical methods to determine the birth year for which the expected life span is 75 years Does this agree with the solution in part a a The birth year is approximately for which the expected life span is 75 years IP und to the nearest whole number as needed