what is a logarithm...???!;:'"*

Dear Student,
The logarithm of a number is the exponent to which another fixed value, the base, must be raised to produce that number. For example, the logarithm of 1000 to base 10 is 3, because 10 to the power 3 is 1000: 1000 = 10 × 10 × 10 = 10³. More generally, for any two real numbers b and x where b is positive and b ≠ 1,

The logarithm to base 10 (b = 10) is called the common logarithm
Regards