3 x [ 5 x ( -3 ) ] = ( 3 x 5 ) x ( -3 ).  State the  property used here.

5 + 3 = ____ + 5.

(681) x ____ = 0.

________ + 1 = 0.

( -7 ) x (-3 ) = _______.

(+ 4031 ) ÷ ( - 4031 ) = ________.

Out of -7, -5, -3, 1, 4, 7, find a pair of integers whose sum is -2.

( -3 ) x ( +5 ) = ______.

I was 4 km east of my home. Now I am 3 km west of my home. How many kilometres did I travel ? 

__________ is neither positive nor negative.