-0.49 + (-13.2 + 0.49) = -0.49 - 12.71 = -13.20
((2/3)^2 + (-6 3/8)) + 6.375 = (4/9 + (-51/8)) + 6.375= (4/9 - 51/8) + 6.375= ((32 - 459) / 72) + 6.375= (-427 / 72) + 6.375= -5.9306 + 6.375= 0.4444
-0.49 + (-13.2 + 0.49) = -0.49 - 12.71 = -13.20
((2/3)^2 + (-6 3/8)) + 6.375 = (4/9 + (-51/8)) + 6.375
= (4/9 - 51/8) + 6.375
= ((32 - 459) / 72) + 6.375
= (-427 / 72) + 6.375
= -5.9306 + 6.375
= 0.4444