Maya used place value and zero in mathematics.
The Maya civilization was a Mesoamerican civilization developed by the Maya peoples, and prominent for its logosyllabic script, the most sophisticated and highly developed writing system in pre-Columbian Americas, along with its art, architecture, mathematics, calendar, and astronomical system. The Maya civilization developed in an area that comprised southeastern Mexico, all of Guatemala and Belize, and the western portions of Honduras and El Salvador.
I think the answer is the second phrase <span>books became available to many people throughout Europe
The need of printing arose when people are becoming more intellectual during the medieval ages. Many writers around this time believed that it is very expensive to hire scribes. They believe that it takes time and effort to train them to write a perfect manuscript. Thus, Gutenberg decided to create a printing press. Because of this, books become available throughout Europe and all over the world.
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A historian would first look at the reliability of a source - when it was published and what was happening at the time (context), who wrote it and their qualifications, any bias the author may hold, whether author sources corroborate the source, whether the author has used references, whether the source provides evidence, who the source is representative of and whether the source provides a balanced perspective
Answer:
Well I don't really know yet but probably 18.
