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The accompanying table shows the operating revenue, in millions of dollars, of wired and wireless telecommunications carriers in the United States in the given year.†

YearWiredWireless
2005205.7140.0
2006195.6157.5
2007197.0173.8
2008194.8184.8

(a) Calculate the regression line for each type of carrier. (Let t be the time in years since 2005, R be the operating revenue of wired carriers and L be the revenue of wireless carriers. Round your regression parameters to two decimal places.) 

R =  Incorrect: Your answer is incorrect.
L =  Incorrect: Your answer is incorrect.


(b) Determine the revenue level at which the two lines cross. Round your answer for the revenue level to one decimal place.

 

______ million dollars

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