Consumption of energy in millions of btu

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U.S. Energy Consumption From 1950 to 1970, per capita consumption of energy in millions of Btu can be modeled by f(x) = 0.25x2 - 975x + 950,845, where x is the year.

(a) During what year was per capita energy consumption at its lowest?

(b) Find this minimum value.

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