Given ln 5 ≈ 1.6

use the log laws to approximate ln 25

any help would be great!

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- Mar 25th 2013, 09:16 PMmathkid182Please help with this question!
Given ln 5 ≈ 1.6

use the log laws to approximate ln 25

any help would be great! - Mar 25th 2013, 09:20 PMProve ItRe: Please help with this question!
$\displaystyle \displaystyle \ln{(25)} = \ln{\left( 5^2 \right)} = 2\ln{(5)}$

Go from here. - Mar 26th 2013, 12:44 AMmathkid182Re: Please help with this question!
ok so ive got 2 ln 5 = 3.22?

do you think that would be the final answer or did i miss a step.

and the full working should show=

=ln (25)

=ln(5^2)

=2 ln 5

=3.22

thanks again for your help - Mar 26th 2013, 12:55 AMProve ItRe: Please help with this question!
That is correct (although of course your final step should have an approximate sign, not an equals sign).

- Mar 26th 2013, 12:58 AMmathkid182Re: Please help with this question!
thats great thanks very much for your support!!