The distance, in miles, from me to a moving train is given by 
.
Here t represents hours since I heard the train whistle.Calculate the distance to the train 5 hours after I heard the whistle.
Definitions:
Cross-Sectional Method
An observational research method that analyzes data from a population, or a representative subset, at a specific point in time.
Longitudinal
A research design in which the same subjects are observed or tested repeatedly over a period of time.
Correlational
Referring to a type of research design that examines the relationship between two or more variables to determine if they are associated in some way.
Longitudinal Research
A research design that involves repeated observations of the same variables over a period of time, extending from months to years.
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