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y = 100-(100/(1+10^(6.35– x))) and y = (100/(1+10^(6.35– x))) , x from 4.3 to 8.3
y = 100-(100/(1+10^(6.35– x))) and y = (100/(1+10^(6.35– x))) , x from 4.3 to 8.3
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