The function models the amount, in grams, of a certain radioactive substance remaining after years since 1990. Which of the following is the best interpretation of "" in this context?
The initial amount of the substance was approximately 47.2 grams.
After approximately 47.2 years, 5 grams of the substance will remain.
The substance is estimated to decay by approximately 5 grams every 10 years.
The amount of the substance remaining is estimated to be approximately 47.2 grams in the year 1995.
