Answered
The following equation needs a starting value for x if GeoGebra is going to solve it.
700=0.06* x^1.093
It is easy to solve the equation by hand (except for calculating the power), so it should be easy for GeoGebra...
I use GeoGebra 5.0.170.
Files:
power.png
The same problem 
If you look at the answer for
Solve[700=0.06* x^1.09]
then you will see why it has trouble with
Solve[700=0.06* x^1.093]
NSolve needs a starting value for non-polynomials
Ok, but it can be a little bit confusing when NSolve does not need x-value for some other kind of equations. For example 5^(x^2-2)=25 will be solved width the command
NSolve[5^(x^2-2)=25]
.
I wish this would work:
NSolve[700=0.06* x^1.093]
Please try 5.0.173.0 :)
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