Question

In 1994 ,the life expectancy of males in a certain country was 65.5 years in 2001 ,it was 68.2 years let E represent the life expectancy in year T and let T represent the number of year since 1994

Answer 1

The liner E (t) that fits the date is (round to the nearest tenth )

Answer 2

use the function to predict life expectancy of males in 2009 E (15) round to the nearest tenth

Answer 3

this is the same as "find the equation of the line between the points (0,65.5) and (7,68.2)

Answer 4

since we are starting at 1994 we can make that year 0
slope is
\[m=\frac{68.2-65.5}{7}=.3857\] rounded. so we assume increase per year of
\[.3857\] years

Answer 5

so your formula would be
\[E=.3857T+65.5\]

Answer 6

nearest tenth is
\[E=0.4T+65.5\]