anybody good with logs??

**question** · January 11th 2007, 04:02 PM

i have log_L (1-r)

with L = 2 and r = 0.02

does any1 know how to put log to the base into a calculator or any other way of calculating it?

**galactus** · January 11th 2007, 04:37 PM

You appear to have $log_{2}(1-0.02)=log_{2}(0.98)$

When entering into a calculator, use the change of base formula.

$log_{b}(u)=\frac{log_{a}(u)}{log_{a}(b)}$

In this case, $\frac{log(0.98)}{log(2)}\approx{-0.02914}$

Do not confuse the change of base formula with the quotient rule for logs.

**question** · January 12th 2007, 08:57 AM

Originally Posted by galactus

You appear to have $log_{2}(1-0.02)=log_{2}(0.98)$

When entering into a calculator, use the change of base formula.

$log_{b}(u)=\frac{log_{a}(u)}{log_{a}(b)}$

In this case, $\frac{log(0.98)}{log(2)}\approx{-0.02914}$

Do not confuse the change of base formula with the quotient rule for logs.

having Tr = 1/1-log_L(1-r)

with L = 2 and r = 0.02

i get this to be equal to 0.97168 and i know the answer is approx 100 so should my answer be multiplied by 100?? is this the rite procedure?

**galactus** · January 12th 2007, 09:11 AM

No. Where does the 100 come from?.

$log_{2}(1267650600228229401496703205376)=100$

**question** · January 12th 2007, 09:42 AM

the answer has to be 100 years its a return period for a flood

**CaptainBlack** · January 12th 2007, 10:02 AM

Originally Posted by question

the answer has to be 100 years its a return period for a flood

Perhaps you should post the actual question you are trying to answer.

RonL

Thread: anybody good with logs??

LinkBack

Thread Tools

Display

anybody good with logs??

Similar Math Help Forum Discussions

Few HW problems involving Logs, Natural logs, and Continuity.

good books forbiing really good at math and physics

Dealing with Logs and Natural Logs

several questions-logs/natural logs

Search Tags