Refer to the graph showing the decay of a radioactive substance. If this substance started decaying 280,000 years ago, and 4 mg of it remains, there was roughly _______ mg of the original substance.

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Refer to the graph showing the decay of a radioactive substance.  If this substance started decaying 280,000 years ago, and 4 mg of it remains, there was roughly _______ mg of the original substance.

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The Answer of Refer to the graph showing the decay of a radioactive substance.  If this substance started decaying 280,000 years ago, and 4 mg of it remains, there was roughly _______ mg of the original substance.

Refer to the Graph Showing the Decay of a Radioactive