Question

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

Answer:

Solution:

102y = 25

(10y)2 = 52

10y = 5

1/10y = 1/5

10-y = 1/5

Answer: (e)

Answer 2

Answer:

Given 102y = 25 ⇒ (10y)2 = 52 ⇒ (10y) = 5 ⇒ (10y)-1 = (5)-1 ∴ 10-y = (5)-1 = 1/5

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