Tell whether the set is closed under the operation indicated. If not closed, provide a counterexample.
1.) integers under addition 2.) integers under division
3.) whole numbers under subtraction 4.) Irrational numbers under addition
anser is open
•°• Hasil dari (9 + 4) × 5 - 18 : 6 adalah 62.[tex] \\ \\ [/tex]Penjelasan dengan langkah-langkah:(9 + 4) × 5 - 18 : 6= 13 × 5 - (18 : 6)= 65 - 3= 62[tex]~[/tex][tex]__________________________________________________________________________________________[/tex][tex] \\ \\ [/tex] [tex]\blue{\boxed{\colorbox{skyblue}{\rm{- AvR}}}}[/tex]
[tex](9 + 4) \times 5 - 18 \div 6 \\ = 13 \times 5 - 3 \\ = 65 - 3 \\ = 62[/tex]