Answer: x = 2^-7 = 1/128
Step-by-step explanation:
Write 4 as 2^2.
Divide by 2^9 gives 2^2/2^9 = x
Write 2^a/2^b as 2^(a-b) or 2^-7
Write 2^-a as 1/2^a
Evaluate 2^7, well known to be 128.
