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wats the question

alrightt

what was the original question? it seems like we are trying to jump into it halfway thru

Maybe my whole difference equation is wrong....

it might be; 'btm' asks alot of these questions and may have some insight

what is btm?

I might be able to help

what is ncmtj?

imran is smart as well :)

alright thank you

thank you amistreo

yn=8000-(.80n)800y_o ?

it should be 8000, no y_0

can you send me whole question

For my difference equation I have yn=〖.80〗_(yn-1) y0=8000

Okay, So I see you are solving for number of healthy trees. which is fine

yeah

Infected trees
y0=8000
y1=8000*(.8)
y2= 8000*(.8)^2

yn=8000*(.8)^2

*correction
yn=8000*(.8)^n

Total - Healthy trees= infected trees
8000-8000*(.8)^n=7560

-8000*(.8)^n=7560-8000
-8000*(.8)^n=-440
(.8)^n=-440/-8000
.8^n=.055
log[.8,.555]=n
n=12.99

ok. that does make much better sense. But how from 8000-8000(.80)^n, did u get 7560?

7560 was given in your problem
"the number of infected elm trees will be 7560"

thats right ok.

your difference equation is
\[y_n=y_{n-1}*.8\]

alright that makes more sense now!!!

would y0 be 8000?

Yes

This is a difference equation for healthy trees

any other question?

that should be it. Thank you so much for your help.

np

hey imranmean, one more question. on the -8000(.80)n= -440, how did it come to Log[.8,.055]?