A certain radioactive substance decays exponentially with yearly decay factor of 0.96. There are initially 103 grams present.
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A: Write a formula that gives the amount A, in grams, of the substance remaining after t years.
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B: How much is left after 7 years? Round your answer to two decimal places.
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C: Plot the graph of A versus t over the first 20 years.
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D: How long will it take until only 26 grams are left? Round your answer to two decimal places.
What will be an ideal response?
A: 
B: 77.40 grams.
C:
B: 77.40 grams.
C:
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D: 33.72 years
Mathematics
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