Answer
Is a function
Domain: {${2005,2006,2007,2008}$}
Range: {${63.5,60.4,62.3,61.2}$}
Work Step by Step
This is a function because there is exactly one y-value for each x-value. To find the domain, we make a set of all possible x-values given by the problem. To find the range, we make a set of all possible y-values given by the problem.