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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

taking square root ... 10^y = ± 5

taking inverse ... 10^-y = ± 1/5

looks like two possibilities ... probably want the positive one
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