$4.[10]$ Using Number Set#$3-$ HEX $71$AF$2523$h$,2$B$988398$h$,9$E$5$E$4$AD$8$h$,6$B$7$C$3487$h $($four hexadecimal numbers$)$ where the first number is Q$,$ the second number R$,$ the third S$,$ etc... calculate each of the following: $[$DO IT IN WORD FILE AND SHOW THE ANSWER WITH ALL CALCULATION AND PASTE THE SCREENSHOT FROM THE WORD$]$

a$)$ Q $+$ R$,$ Q $+$ S$,$ Q $+$ T $($show the carry value $9$th digit, if there is a carry value$)$

b$)$ Q $$ R$,$ Q $$ S$,$ Q $$ T $($use the TWO$$s complement method$)$