Ariver has a flow velocity of 3 cm/s, an aeration coefficient of 0.5 d–1, and a temperature of 20°c. after initial mixing with wastewater, the river has a do concentration of 8.0 mg/l, an ultimate bod of 25 mg/l, and a bod decay constant of 0.8 d–1. neglecting the effect of sedimentation on bod removal, determine the distance over which the do is less than or equal to 7 mg/l.

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the fed will purchase bonds from banks to inject money into the banking system. the banks can use these funds to provide loans to individuals and businesses.

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