Heating oil is to be poured at the constant rate of 4.5 gallons per minute into a 400-gallon tank that already contains 115 gallons of heating oil. What fraction of the tank’s total capacity will be full in 30 minutes?

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Q: Derive the Least Squares Estimator 3 of the parameter 3 in the no-intercept model Y₁ = Bα₁ + Ei,

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