a) ( -48 ) + 48 . ( -78 ) + 48 . ( -24 )
= 48 . ( -1 - 78 - 24 )
= 48 . ( -103 )
= -4944
b) 31 . ( -18 ) + 31 . ( -81 ) - 31
= 31 . ( -18 - 81 - 1 )
= 31 . 62
= -3100
c) 35 x 18 - 5 x 7 x 28
= 35 x 18 - 35 x 28
= 35 x ( 18 - 28 )
= 35 x ( -10 )
= -350
d) ( -16 ) + 24 + 16 - 34
= [ ( -16 ) + 16 ] + ( 24 - 34 )
= 0 + ( - 10 )
= -10