Based on data for the years 1910-2007, the expected life span of people in Country A can be described by the function f(x) = 10.963 + 14.322 In x, 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. (Round to the nearest whole number as needed.)

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Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.