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Table shows the number of cellular phone subscribers in the United States and their average monthly bill in the years from 2000 to 2010.
YearSubscribersAverage Local (millions)Monthly Bill ($)2000109.545.272001128.447.372002140.848.402003158.749.912004182.150.642005207.949.982006233.050.562007255.449.792008262.750.072009276.648.162010300.547.21
One of the scatter plots clearly suggests a linear model. Use the points at t=10 and t=20 to find a model in the form y=mx+b.
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