Question 448545
{{{35=18(0.8)^q}}}
<pre>
{{{35=18(8/10)^q}}}

{{{35=18(4/5)^q}}}

{{{35/18=(4/5)^q}}}

{{{ln(35/18) = ln(4/5)^q}}}

{{{ln(35/18) = q*ln(4/5)}}}

{{{ln(35)-ln(18)=q*(ln(4)-ln(5))}}}

{{{(ln(35)-ln(18))/(ln(4)-ln(5))=q}}}

{{{q=(ln(35)-ln(18))/(ln(4)-ln(5))}}}

Edwin</pre>