What is Log Base 10 of 10000?

The below is the work with steps to find what is log base 10 of 10000 shows how the input values are being used in the log base 10 functions. Formula:
log_b(x) = y, if b^y = x

Input:
x = 10000
b = 10

Solution:
y = log₁₀ 10000
= log₁₀ 10⁴
= 4 log₁₀ 10 = 4 x 1
log₁₀ 10000 = 4
log₁₀(10000) = 4