Plzz i need some questions from propagation in error

1.	Plzz i need some questions from propagation in error
Answer» Area = l×b hota hai na toh phir.We have l and b then l×b = 4×2+-004×004.=8+-016.Error always increase .<br>1st ka 6± 0.16 hoga na?<br>1) ka ans hoga 8+-0.16 m^2.2) ka ans hoga 4+-0.44<br>Mass = 40+-0.4g .Volume= 10+-1cm^3.Find density.?<br>Ok. Find the area of rectangle whose length is 4+-004m and breadth is 2+-004 . Find the area in proper unit.

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