How many years is it in college for both botany, cooking, and mechanic's together?

It can take anywhere from 6 years to 10 years. Depends on the university.

In most unis:

Botany - 4 years

Culinary school - 4 years

Mechanical trade - 2 years

Hope that helps

from the word list given, the most suitable words that relate to the reason information were written would be:  

objectivity: lack of bias, judgment, or prejudice

accuracy: free of mistakes, to be correct

authority: the ability to tell people what to do or believe in

content: to be satisfied  

it can be said that the author made the article to present objectivity, to provide accurate information, to be the authority in the subject that he or she writes, and to be satisfied of the information quality given out.