taking square root ... 10^y = ± 5
taking inverse ... 10^-y = ± 1/5
looks like two possibilities ... probably want the positive one
If 10^2y = 25, then 10^-y equals:
(a) -1/5, (b) 1/625, (c) 1/50, (d) 1/25, (e) 1/5?
1 answer
1 answer