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Determine where the function is concave upward.
Expanded
Increased in area, scope, or size; enlarged or extended.
Income
A measure of money that individuals or businesses receive, usually through wages, investments, or sales.
Voting
The action of expressing a choice or opinion in matters such as electing public officials, passing laws, or making decisions in referendums, typically through a ballot.
Relationship
A connection, association, or involvement between people, whether personal, professional, or societal.
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