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:

102y = 25

(10y)2 = 52

10y = 5

1/10y = 1/5

10-y = 1/5

Answer: (e)

Answer 2

Step-by-step explanation:

$102y = 25 \\ y = \frac{25}{102 }$

now,

$10 - y \\ 10 - \frac{25}{102} \\ = \frac{1020 - 25}{102} \\ = \frac{995}{102}$