new sections

optimization
Merge branch 'master' of https://github.com/sergeballif/NSC-Math-120

Conflicts:
	ExpectedValue/ExpectedValue.tex
	IntroToFunctions/IntroToFunctions.tex
	StatsIntro/StatsIntro.tex
fix conflicts

added \end{document} several places but created conflicts
Merge branch 'master' of https://github.com/sergeballif/NSC-Math-120