anonymous
  • anonymous
Can someone please help me solve this: In 1920, the record for a certain race was 46.7 sec. In 1930 it was 46.5 sec. Let R(t)=the record in the race and t=the number of years since 1920. Find a linear function that fits the data(Round to the nearest hundredth)
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
easy cake. change in R(t) for every 10 increments of t is -.2 so -.2/10=-.02 R(t)=-.02t+46.7
anonymous
  • anonymous
yes this was easy
anonymous
  • anonymous
ok now i need to know how to figure out the predicted record for 2003

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anonymous
  • anonymous
and 2006
anonymous
  • anonymous
I think the correct answer would be 45.04 is that right?
anonymous
  • anonymous
hmmm? sorry was away. 2003-1920=83 2006-1920=86 plug those in to t
anonymous
  • anonymous
first one's right second one's 44.98
anonymous
  • anonymous
ok that's what I came up with too
anonymous
  • anonymous
nice medal me =D
anonymous
  • anonymous
ok now my next task is to figure out when the recod will be 44.76 sec
anonymous
  • anonymous
so R(t)=44.76 44.76=-.02t+46.7 solve for t

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