Here's the question you clicked on:
burhan101
Log
Formula is \[\huge M=\log \frac{ I }{ I _{0} }\]
richter scale is log base 10 so compute \[\frac{10^{8.3}}{10^{7.6}}=10^{8.3-7.6}=10^.7\] then use a calculator
for number 6. which formula form the ones listed do i need @satellite73
i am not sure what you are asking it is really just a matter of subtracting, then taking ten to that power
So no formulas are involved ? like i'm talking about the formulas at the top of the page