A periodical index<span> contains citations for articles in magazines, journals, and newspapers which can be retrieved through searching. Some </span>periodical indexes<span>also include abstracts (brief summaries) of the articles and sometimes even the full text or entire content of articles as they originally appeared. You're welcome ;)</span>
When you do math you are adding, rooting, graphing etc. When you are doing social studies you are studying people and population. It can also be about geography and how people live today. You are being social.
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Answer:
7 is the answer please give branliest
