What is the log base when no base is there

The Common and Natural Logarithms. A logarithm can have any positive value as its base, but two log bases are more useful than the others. ... If a log has no base written, you should generally (in algebra classes) assume that the base is 10.

answer; /// the correct answer is evidence of the olmec civilization has been found in southern american in a hot steamy forest, archaeologists have found earthen artifacts at several sites that were evidence of the olmec civilization. these   artifacts were mounds,courtyards and pyramids build of stones, also on top of the mounds were many monuments made of stone, some of these stone structures are very large, they weigh as much as 44

a.) a poor farmer, due to the fact that they would want to be freed from british rule.