Prove the following: [(-4) `xx` (-3)] `xx` (-5) = (-4) `xx` [(-3) `xx` (-5)]

Prove the following: [(-50) xx (-2)] xx (-3) = (-50) xx [(-2) xx (-3)]

Prove the following: (-3) xx [(-4) + (-5)] = [(-3) xx (-4)] + [(-3) xx (-5)]

Prove the following: (-20) xx (13 xx 4) = [(-20) xx 13] xx 4

Prove the following: (-5) xx [(-76) + 8] = [(-5) xx (-76)] + [(-5) xx 8]

Prove the following: 42 xx [7 + (-3)] = [42 xx 7] + [42 xx (-3)]

Prove the following: 103 xx 25 = (100 + 3) xx 25 = (100 xx 25) + (3 xx 25)

Find the values of the following and check for equality: (-6) xx (4 + (-5)) and ((-6) xx 4) + ((-6) xx (-5))

Check the following for equality: 3 xx [(-4) + (-10)] and [3 xx (-4) + 3 xx (-10)]