Tuesday, January 1, 2008

help on #27 treasure

is this question where you use M/1+Ae^(-kt)?
and what do you do with the 600-P?

9 comments:

Anonymous said...

i need help on this prblem too
i don't know what it means by a rate proportional to 600-p

Anonymous said...
This comment has been removed by a blog administrator.
Cindy said...

Is it logistic? Does it say so? Otherwise treat it as some other random differential equation that you have to integrate and find the solution for yourself. There was a Ch 6 Test question very similar to this one that MANY people missed. But not everyone. So someone's got to speak up!

MariaCJen said...

I don't think this is a logistic problem. Iremember one like this on the Chapter 6 test because I missed it haha. However, I think when it says at a rate proportional to 600-p that means you make the equation (the one that you write up from the problem) equal to 600-p, but I'm not 100% sure. Sorry, if I'm wrong!

Daryl Wang said...

The way I did was I made dP/dt equal to (600-P)k, since when growth is proportional to population the differential equation is equal to Pk. Once you have the differential equation dP/dt=(600-P)k you can integrate the equation. Solve for A and k by plugging in the information given. I got a reasonable answer for this one, so I think should work.

Anonymous said...

thanks

judy said...

i did what daryl did and got around 25 but i already have that answer...

judy said...

nvm i got it

MariaCJen said...

watch out for the negative signs.. if you're still reading this blog because that's what made me confused at first