If 102y = 25, then 10-y equals:
Choose the most appropriate option
A) -1/5  B) 1/625  C) 1/50  D) 1/25  E) 1/5
102y = 25   (10y)2 = 52   10y = 5   1/10y = 1/5   10-y = 1/5   Answer: 1/5   )
<result>E</result>
If 102y = 25, then 10-y equals: