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Calculate ΔE, if a system releases 66.9 kJ of heat to its surroundings while the surroundings do 44.0 kJ of work on the system.? When given the equations x-y=-1, 2y-x=27, x+y =11 how would you use row echelon form to get to the answer (5,6)? A man is 5 times as old as his son 2 years ago the sum of the squares of their age was 114 find the present age of son?answer is 7? Suppose that your mixture showed a good TLC separation with methylene chloride, but you inadvertently eluted the column with methanol.? Is electricity more dangerous and destructive than fire?