What is Log Base 2 of 16?

The below is the work with steps to find what is log base 2 of 16 shows how the input values are being used in the log base 2 functions. Formula:
log_b(x) = y, if b^y = x

Input:
x = 16
b = 2

Solution:
y = log₂ 16
= log₂ 2⁴
= 4 log₂ 2 = 4 x 1
log₂ 16 = 4
log₂(16) = 4