Algebra
posted by Kimi on .
In 1995, the life expectancy of males in a certain country was 64.8 years. In 1999, it was 67.2 years. Let E represent the life ecpectancy in year t and let t represent the number of years since 1995.
E(t)= t+ (round to nearest tenth
Use the function to predict the life expectancy of males in 2006. E(11)=
(round to nearest tenth)

In 199564.8 yrs
In 199967.2 yrs
To write the equation, use the points
1999  1995 = 4 yrs
1995(0, 64.8)
1999(4, 67.2)
Equation through two points,
y  y1 = (y2  y1)/(x2  x1) * (x  x1)
y  64.8 = (67.2  64.8)/(4  0) * (x0)
y  64.8 = 2.4/4 x
y  64.8 = 0.6x
y = 0.6x + 64.8
Since, the function should be E(t),
E(t) = 0.6t + 64.8
To find E(t) for 2006,
E(11) = 0.6(11) + 64.8
E(11) = ? 
Thank you so much for the help. Although still slightly confused I now have something to work with to figure out what I am doing. I have had such a difficult time with this class. If it wasn't for all of you guys I would be lost. Thanks again