Answer: 10,000 or 10^4
Step-by-step explanation: I will assume in the problem that the logarithm is of base-10. We can therefore rewrite the equation in words as 10^4=x. The general form of a logarithm is log base y of x=z. This can be rewritten as y^z=x. We are doing the same thing here. We know that 10^4 is 10,000 so that is our answer.
Hope this helps!
For practice here are some problems (assume all logarithms are our base 10): log x = 3, log x = 1.