Re: Laws of Logarithms HELP!

Quote:

Originally Posted by

**Scottrich12** I need to use laws of logarithms methods to simplify and evaluate these equation

5^{n} = 7 x 2^{n}, rearrange and make n the subject

$\displaystyle n=\frac{\log_{10}(7)}{\log_{10}(5)-\log_{10}(2)}$

Re: Laws of Logarithms HELP!

That's the answer but how did you get it?

Re: Laws of Logarithms HELP!

Quote:

Originally Posted by

**Scottrich12** That's the answer but how did you get it?

$\displaystyle \left( {\frac{5}{2}} \right)^n = 7$

Re: Laws of Logarithms HELP!

How about

θ = 250 x e-0.05 x t and make t the subject

and continuing from that

what is the value of t when θ = 195◦C