They are the same because 800 cm = 8 meters
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Actually it’s not so
To convert square millimeters to square meters, you need to divide by 1,000,000. So, 800 mm x 800 mm = 640,000 square millimeters. Dividing this by 1,000,000 gives you 0.64 square meters. Therefore, 800 x 800 mm is equal to 0.64 square meters.
They are equal since 1m=100cm
8m + (4n - 6m) + 9n =8m + 4n - 6m + 9n =(8m - 6m) + (4n + 9n) =2m + 13n
d=n+8m