Question 256170
We have the following:
(i) {{{5^(n-1) = 1/25}}}
step 1 - rewrite 1/25 as a power if 5.
(ii) {{{5^(n-1) = 5^(-2)}}}
erase the base 5 and solve to get
(iii) {{{n-1 = -2}}}
{{{n = -1}}}