A watering system holds 500 gallons of water. Water is added into the system at a rate of 8 gallons per minute. 8 gallons of water per minute is removed from the system to water plants. Fertilizer is pumped into the watering system at a rate of 0.08 pounds of fertilizer per gallon of water. Set up the differential equation that models this situation. dF A =0.64 0.016 * F dt dF = 0.64 - 4000 F dt B dF 500 – 0.64 * F dt dF = 0.016 – 0.64 * F dt dF E = 500 - 0.08 F dt

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