1.   if (-9)+(-10)#(-9)-(-10),then # is___
2The value of 171 +151-171-1-31,where1.1 is absolute value of an integer is______

Answer :

1 )  If ( - 9 )  + ( - 10 ) , SO we get

- 9 - 10 =   - 19                                               (  As we know  + $\times$ -   = - )

And

( - 9 ) - ( - 10 )   , So we get

- 9 + 10  =   1                                                (  As we know -  $\times$  - = + )

We can say ,

- 19 < 1  , So

( - 9 )  + ( - 10 )  < ( - 9 ) - ( - 10 ) 

Then

#  is    <                                                                 ( Ans )

2 ) Value of  171 + 151  - 171 - 1 - 31 

= 171  - 171  + 151  - 31  - 1 

= 151 - 31 - 1

= 121 - 1

= 120                                                                     ( Ans )