Logarithm - General Questions

If log₅ x = 4, what is x?

Simplify: log (5⁴) / log (5²)

If log₂ x = 9, what is x?

What is the value of log 8 + log 125?

If log 2 = 0.301 and log 3 = 0.4771, what is the value of log 16?