Sure.
"Growth" means getting bigger as time (or 'x') goes on.
"Decay" means getting smaller as time (or 'x') goes on.
growth because the line is increasing as it continues over the graph as opposed to going down as it continues across the graph.
The graph likely depicts either exponential or logistic growth. Exponential growth shows rapid increases, while logistic growth starts fast and then levels off. Identifying the curve's shape is key to understanding the growth type.
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