A scientist is studying the decay of a radioactive substance. The mass , in grams, remaining after hours is given by the function . Which of the following is the best interpretation of the statement "" in this context?
After 24 hours, 25 grams of the substance have decayed.
After 25 hours, 24 grams of the substance remain.
The substance has a half-life of 24 hours, and 25 grams remain.
After 24 hours, 25 grams of the substance remain.
