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Ice Age in 2018? The trees can help make the air better by using carbon dioxide and giving off oxygen? Assume a Normal Distribution with a mean of 98.7 and IQR or .67. Find the standard deviation. I do not know where to begin with this one? What is total resistance of equivalent triangle,where each side having same resistance R.? 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?