actual:={[0,3.9],[10,5.3],[20,7.2],[30,9.6],[40,12],[50,17],[60,23],[70,31],[80,38],[90,50],[100,62],[110,75],[120,91],[130,105],[140,122],[150,131],[160,151],[170,179],[180,203],[190,226],[200,249],[210,281]};

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with(plots);

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plot1:=pointplot(actual);

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p:=3.9*exp(0.03067*t);

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plot2:=plot(p,t=0..210);

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display({plot1,plot2});

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