Answer:
[tex]5^{4}[/tex]
Step-by-step explanation:
We use exponents to simplify long multiplication. The number of the exponent stands for how many of the number you have.
Because we have 4 5s, the exponent is 4.
Something like 5x5x5 would be [tex]5^{3}[/tex], because there are 3 5s.