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I took 2 hits out of a bowl and I have been clean for over 2 months how long till its out of my system ? I m 120 and I m 5 3 if that helps? In integration why let sqrt(x) = 3*sin(u)? For 150 gm sample of phosphorus trichloride calculate the number of grams of Cl atoms in the sample? Why do the first three alkanes (Methane ethane and propane have only one structure ? Problem the electric field is given E= -(ai+bj+ck) ,where a,b,c are constants .Find the potential (x,y,z) in consideration of (0,0,0)=0?