Answer:
[tex]5^4\\[/tex]
Step-by-step explanation:
Recall that exponents are a convention used to simplify the writing of expressions that involve the multiplication of a repeated factor by using as the base of the exponent the factor that is multiplied, and for the exponent the number of times the actor appears:
[tex]a\,*\,a\,*\,a\,*\,a=a^4[/tex]
so in your case, the base (repeated factor) is 5, and the exponent (number of appearances of the factor 5 is 4:
[tex]5*5*5*5=5^4[/tex]
