Overweight Americans If trends continue, the past and future percentages of the population who are overweight can

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Overweight Americans If trends continue, the past and future percentages of the population who are overweight can be estimated by W(x) = x + 45, where x represents years after 1980. 

(a) Interpret the slope of the graph of W. 

(b) Estimate when this percentage was between 70% and 77%.

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