Question

If 102y = 25, then 10-y equals:

(a) -1/5,
(b) 1/625,
(c) 1/50,
(d) 1/25,
(e) 1/5

Answer 1

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$<u>Solution$

102y = 25

(10y)2 = 52

10y = 5

1/10y = 1/5 

10-y = 1/5

Answer: (E)


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Answer 2

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