Solve the sums

Please find below the solution to the asked query:

i ) We have : ( - 144 )  and ( - 54 ) , So

( - 144 )  + ( - 54 ) = - 144  - 54 = - 198 ( That is als a integer )

Since (- 198 ) is also an integer we can say that " Integers are closed under addition . "

And

( - 144 ) $\times$ ( - 54 ) = 7776 ( That is alo a integer )

Since ( 7776 ) is also an integer we can say that " Integers are closed under multiplication . "

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