3d is visual, 4d is visual and interactive such a a 3d rollercoaster ride where the chair tilts, i'm guessing 5 and 6d will be full immersion with surround screen so it is all around you with holographic characters that look like they are standing next to you, maybe with temperature fluctuations and the long anticipated smell-o-vision!!
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10y plus 40 equals 50y.
280
this equals 818
A number "m" plus 40 equals 60. Therefore, 60 minus 40 equals m. m therefore equals 20.
40