Question

If 10^2y = 25, then 10^-y equals:

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

Answer 1

Answer
(e) 1/5

Step-by-step explanation
5^2=5*5=25

Answer 2

`{10}^(2y) = 25`

`{(10)}^(y2) = {5}^(2)`

`{10}^(y) = 5`

`\frac{1}{10 {y} } = (1)/(5)`

`{10}^( - y) = (1)/(5)`

answer= option e.