graph y = 100/((10^(6.88-x)) + 1) and y = 100 - (100/((10^(6.88-x)) + 1)), x from 4 to 9 graph y = 100/((10^(6.88-x)) + 1) and y = 100 - (100/((10^(6.88-x)) + 1)), x from 4 to 9

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