It seems the question is (a^4)^5
To simplify or multiply exponents we apply property of exponents.
We multiply the exponents using power property
(x^m)^n = x^(m*n)= x^(mn)
We apply this property in our problem
Multiply the exponents 4 and 5
4*5 = 20
(a^4)^5 = a^20
In the grid, enter 20 that is the product of the exponents.