Finding x in fraction with scientific notation

Hi I need help with this problem...I cant figure it out...help would be appreciated! (Trying to find x)

Do you know your power rules?

You need the rules:




So for example, in your setup, we have



And you could multiply both sides of the equation by to get rid of that in the denominator on the right hand side.

Hope this gives you a clue. Otherwise, feel free to ask about troublesome parts.