Question

Can anybody explain how to do this? The answer I keep getting isn't one of the options.
Which choice is equivalent to: 5^-2 * 25^-1
a. 5^3
b. 5^4
c. 5^-1
d. 5^-4

Answer 1

I think is D


5^-2*25^-1
5^-2*5^-2
5^-4
1/5^4
1/625
0,0016, 5^-4