# Exponential Functions...

• Aug 25th 2008, 12:38 PM
mcdanielnc89
Exponential Functions...
Hey guys,

My reading materials didn't really explain how to do these. I have provided an example of one, and would liek ot know hwo to do them. I have a test on them tomorrow, but do not understand them.

Thanks!

http://img76.imageshack.us/img76/7237/71700548ih8.png
• Aug 25th 2008, 12:50 PM
Jhevon
Quote:

Originally Posted by mcdanielnc89
Hey guys,

My reading materials didn't really explain how to do these. I have provided an example of one, and would liek ot know hwo to do them. I have a test on them tomorrow, but do not understand them.

Thanks!

http://img76.imageshack.us/img76/7237/71700548ih8.png

this is simply asking for N(10) and N(60), since that gives the number of bacteria after 10 and 60 minutes respectively, as that is how N(t) was defined

can you continue?
• Aug 25th 2008, 12:58 PM
mcdanielnc89
Quote:

Originally Posted by Jhevon
this is simply asking for N(10) and N(60), since that gives the number of bacteria after 10 and 60 minutes respectively, as that is how N(t) was defined

can you continue?

So I'd do something like this?

\$\displaystyle N(10) = 4000(2)^10/20\$
\$\displaystyle N(60) = 4000(2)^60/20\$
• Aug 25th 2008, 01:01 PM
Jhevon
Quote:

Originally Posted by mcdanielnc89
So I'd do something like this?

\$\displaystyle N(10) = 4000(2)^{10/20}\$
\$\displaystyle N(60) = 4000(2)^{60/20}\$

yes, just fix your LaTeX :p
• Aug 25th 2008, 01:02 PM
mcdanielnc89
for pitty sakes. I've been trying to do that the last half hour in the calculator, lol...+

Thank you,. i see what i dind't do, haha
• Aug 25th 2008, 01:04 PM
Jhevon
Quote:

Originally Posted by mcdanielnc89
for pitty sakes. I've been trying to do that the last half hour in the calculator, lol...

to be safe, type 2^(10/20) and evaluate first, then multiply the answer by 4000. a similar thing for the 2nd one

half an hour? wow (Speechless)
• Aug 25th 2008, 01:04 PM
mcdanielnc89
lol, I am not good with calculators, LOOOOOL....

TYSVM
• Aug 25th 2008, 01:07 PM
Jhevon
Quote:

Originally Posted by mcdanielnc89
lol, I am not good with calculators, LOOOOOL....

TYSVM

neither am i, but you're worse than i am (Giggle)

not to make you feel bad or anything (Handshake) just two friends messing with each other :D
• Aug 26th 2008, 09:51 AM
mcdanielnc89
haha... no worries!