For sets

Aequals$=$StartSet negative $5,$negative $2,$negative two sevenths,$0,$pi$,6,8,$StartFraction $23$ Over $2$ EndFraction EndSet$5,2,27,0,$$,6,8,232$

and

Bequals$=$StartSet negative $2,0,$pi$,7,9$ EndSet$\{2,0,$$,7,9\},$

find $($a$)$

Aintersect$$B

and $($b$)$

Aunion$$B