Idk why, but this one isn't working out

Help?

Thanks

Anybody?

Give me a minute. I'll help with this ! Just need to dig up something.

E: I'll need to look it up, but iirc the formula is somewhere along the lines of A(t) = Pe^rt

e2: Looks like Triton did it, guess its the formula I was planning on using

This post was edited by Sefira on Feb 13 2014 07:17pm

plug in 20,000 for P, then solve for t.

20000=16968e^(.019t)

divide both sides by 16968:
1.17869 = e^(.019t)

next take ln of both sides:
ln (1.17869) = ln (e^(.019t))
ln (1.17869) = .019t

then divide both sides by .019:

8.65 = t


if t=1 represents 1991, then t=8.65 represents 1998
So the population will reach 22 million sometime during 1998

Why would you plug in 20000?

And the answer in the back of the book says 2003

This post was edited by IImuseII on Feb 13 2014 07:21pm

It's in the thousands

I'll try doing it.

E: He did 20,000 in beginning instead of 22,000

22,000 = 16,968e^0.019t

.019t ln e = ln 1.297
.019t = 0.260
t = 13.68

E: I'm getting 2005 as it's 2004.68.

This post was edited by Sefira on Feb 13 2014 07:27pm

you plug in 22000 because P is measured in thousands.

I see I started with the wrong plug-in value!
Change 20000 to 22000 and work it the same way

Ah ha is in thousands.

That's where i went wrong.

Thanks guys!



Dang Idk how I missed it.

It says it right there! Lol

This post was edited by IImuseII on Feb 13 2014 07:36pm

easy mistake to make