- Same problem as everyone else....and I see no fixes...useless help page?

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Why won't my math teacher let me divide by zero? (geometry )Help at solving this? What common house hold item unlocked the discovery that dna was blue print of life? IF ARG (Z-1)=π/6AND ARG (Z+1)=2 π/3 THEN PROVE THAT [Z]=1? If water has a [H+] =1x10^-7 M,how is it possible to, by adding a base to the water to decrease This concentration.(In terms of equilibrium)?