Question

can someone helpplease
in 1993 the life expectancy of males in a certain country was 70.8 years in 1997 it was 73.3 years let E represent the life expectancy in year t and let t represent the number of years since 1991
The linear function that fits the data is:
E(t) = --t + -
round to the nearest tenth

use the function to predict the life expectancy of males in 2007
E(14) = --
round to nearest tenth

Answer 1

Look at 1993
70.8 = 1993 -1991 + c
= 3+ c
c = 67.8

therefore E(t) = year -1991 + 67.8

Now use this to check data in the year 1997
73.3 = 1997-1991 + 67.8
73.3 = 6 + 67.8 (should that read 73.8 by the way not 73.3?)

Now do the last part...,
E(14) =2005 -1991 + 67.8

81.8

Answer 2

no it is 73.3