# Thread: Some one please help me! How do I make this word problem into a linear function?

1. ## Some one please help me! How do I make this word problem into a linear function?

In 1990 the life expectancy of females (in the U.S.) was 78.8. in the year 2000, it was 79.8. Let f(t) reoresebt life expectancy and t the number of years since 1990. Then use this function to estimae the life expectancy of females in 2008.

2. Originally Posted by imbadatmath
In 1990 the life expectancy of females (in the U.S.) was 78.8. in the year 2000, it was 79.8. Let f(t) reoresebt life expectancy and t the number of years since 1990. Then use this function to estimae the life expectancy of females in 2008.
someone responded to this question here.

please do not double post. it is against the rules

3. hi I haven't really done any maths like this exactly.

Emmm it could be something like(this could be totally wrong, sorry)

F(0)=78.8
F(10)=79.8

and you're looking for
F(18)=

4. Originally Posted by Ilusa
hi I haven't really done any maths like this exactly.

Emmm it could be something like(this could be totally wrong, sorry)

F(0)=78.8
F(10)=79.8

and you're looking for
F(18)=
you are close!

what you said was true. the problem is, how would we go about finding f(18)

i answered that in the other post i provided a link to