<span>The base in the question you provided is the variable x,
hope this helps.
~BlurryFace</span>
First, let's find all the factors of 81:
81/3=27
27/3=9
9/3=3
3/1=1
So the factors of 81 are 3,3,3,3, (the numbers by which we divided here).
This means we can write down 81 as 3*3*3*3 or

- which is the answer to the question! (three to the power of 4)
Answer:
Step-by-step explanation:
Neptune is about four times wider than Earth.