Question 201382
a) 


Function is R(t) = -0.04t + 45.6 (close, but no cigar)


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b) 


2003 ---> t=83

--> R(83) = -0.04(83) + 45.6 = 42.28


In 2003, time is approx 42.28 sec.



2006 ---> t=86

--> R(86) = -0.04(86) + 45.6 = 42.16


In 2006, time is approx 42.16 sec.



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c) 


43.86 = -0.04t + 45.6


43.86 - 45.6 = -0.04t 


-1.74= -0.04t 


t = 43.5


Year will be 1920+43 = 1963 (mid year)