Physics, 19.02.2020 21:57, Guidomigoo3x

The United States has been consuming iron ore at the rate of R(t) million metric tons per year at time t, where t is measured in years since 1980 (that is, t=0corresponds to the year 1980)

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The United States has been consuming iron ore at the rate of R(t) million metric tons per year at ti...