Weight = m g
m = weight/g = 39.2/9.8 = 4 kg
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392 56 x 7 = 392
√392 ~= 19.799
Yes. 19.7989 is the square root of 392. But 392 is not a perfect square.
The LCM is 392.
The LCM of 1521 and 392 is 596232. The LCM of 15, 21 and 392 is 5880.