Answer:
The answer is First option
1/2^12
.

Step-by-step explanation:
Given:
(2^-3)^4
i.e

To Find:

Solution:
Law of Indices

Using the above Property we get
∴ 
The answer is First option
1/2^12
.

N^2 - n = 90
n^2 - n - 90 = 0
(n - 10)(n + 9) = 0
n - 10 = 0
n = 10
n + 9 = 0
n = -9
answer is : n = 10 and n = -9