Answer:
Explanation:
find the solution below
10 million years
For a sample to decay to 25% of its original amount, 2 half lives must have passed. Since one half life is 5 million years, multiplying this by 2 gives us that 2 half lives is 10 million years.
10 grams
so it your face because if you think about it ya dont need to cheat\
hi me name bob