Answer:
The first one
Step-by-step explanation:
240 days is 4 times the half-life, which means that a sample of 1000 mg will decay to

after 240 days.
2.20 rounded to the nearest tenth is 2.2 it is already rounded if it was 2.29 it would be 2.3
Answer:
look do is gone eat
Step-by-step explanation:
ok