Answer:
-7 goes in the box
Step-by-step explanation:
x^ -3 = x^4 * x^n
We know that a^b * a^c = a^ (b+c)
x^-3 = x^(4+n)
When the bases are the same the exponents are the same
-3 = 4+n
Subtract 4 from each side
-3 -4 = 4+n-4
-7 = n
