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The annual yield per walnut tree is fairly constant at 60 pounds per tree when the number of trees per acre is 20 or fewer. For each additional tree over 20, the annual yield per tree for all trees on the acre decreases by 2 pounds due to overcrowding. Fi...

A typical scuba diving tank is initially filled with pressurized air at 3000in2. A good diver constantly monitors the air tank pressure during a dive. (a) [10 points] Suppose Cherie is using air at a rate of 42 lb per minute. Assuming she should surface w...