The quadratic function (x) = 0.0118x 2 + 0.8633x + 317 models the worldwide atmospheric concentration of

The quadratic function ƒ(x) = 0.0118x² + 0.8633x + 317 models the worldwide atmospheric concentration of carbon dioxide in parts per million (ppm) over the period 1960–2013, where x = 0 represents the year 1960. If this model continues to apply, what will be the atmospheric CO₂ concentration in 2020? Round to the nearest unit.