Please can someone help my assignment

1st box(the top one in the middle row): 5^4-5 = 5^-1

2nd box(the top one in the last row): 5*5*5*5/5*5*5*5*5 = 1/5

3rd box(the bottom one in the middle row): x^-6

4th box(the bottom one in the last row): x/x*x*x*x*x*x*x=1/x^6

i believe the answer is d.

hope it you! : d