Suppose the rate of change of the expected life span l at birth of people born in the United States can be modeled by 
where t is the number of years past 1920. Use integration and the data point for 2007, to find the function that models the life span. If it's necessary, round your calculations to three decimal places, 
Definitions:
Goal
An objective or desired outcome that an individual or organization aims to achieve within a specific timeframe.
Economic Models
Simplified representations of complex economic processes, used to predict and analyze economic behaviors and outcomes.
Complexity Of Reality
The notion that real-world situations are intricate due to interconnections and interdependencies among various elements and variables.
Simplifications
The process of making something easier to understand or do by reducing its complexity.
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