I have number y(exponent x) and number w. I know y and w and i need to get x. Any ideas?

Thanks squire CaptainMan but our memories do not need refreshing - we just need a proper question.

Show us the picture (if you got any) of the math situation. I think a pic would come in handy and will refresh the math masters and will allow them to help you.

the solution is by using the logarithme fonction.