Question: Plotting Radioactive Decay

Hi all,

This is my first time working on a problem using Maple, and I've run into some issues regarding plotting my findings. After putting in the information for the plot (p:= plot([y1], t = 0..56562.16837, y = 0.10]), I keep receiving the warning "Expecting only range variable t in expression y[1] to be plotted but found name y[1]. I attached the Maple worksheet below for more information, trying to work my way through plotting in Maple.

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