A radioactive substance decays exponentially. If 900 grams were present initially and 500 grams are present 100 years later, how many grams will be present after 400 years? Round your answer to two decimal places, if necessary.

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The Answer of A radioactive substance decays exponentially. If 900 grams were present initially and 500 grams are present 100 years later, how many grams will be present after 400 years? Round your answer to two decimal places, if necessary.

A Radioactive Substance Decays Exponentially