Please excuse my ignorance for posting this question, but I am confusing myself here. All I want to know is if I am rearranging this equation properly to find the value required... Question I want to rearrange the following equation to make F1 the subject. Equations m1-m2=-2.5log10(F1/F2) My Thinking So rearranging the above formula for F1 it becomes: F1=10-(m1-m2)/2.5 x F2 When it comes to rearranging logs (one of the most straight forward and simple things, I know) I find myself easily confused. Please don't tell me the correct arrangement if I am wrong, just a little guidance please. Thank you in advance!