Question 449627: I have this story problem:
In 1991, the life expectancy for males in a certain country is 66.4 years. In 1996, it was 70.0 years. "E" is to represent the life expectancy in year t and t represents the number of years since 1991.
E=__(t) + __
(round to the nearest tenth)
Use the function to predict the life expectancy of males in 2009.
E(18)=__
(round to the nearest tenth)
Could someone solve this for me?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! In 1991, the life expectancy for males in a certain country is 66.4 years. In 1996, it was 70.0 years. "E" is to represent the life expectancy in year t and t represents the number of years since 1991.
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points: (0,66.4), (5,70)
slope = (70-66.4)/5 = 0.72
y-intercept: 66.4
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E(t) = 0.72t + 66.4
----------------------------------------
(round to the nearest tenth)
Use the function to predict the life expectancy of males in 2009.
E(18)=0.72*18 + 66.4 = 79.36
(round to the nearest tenth)
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Cheers,
Stan H.
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