Question

The half life of Chemical Q is 12 days. If you started your experiment with 42 grams, how much would be left in 73 days?

Answer 1

`=0.656` grams

Explanation:

During `73` days chemical Q will decay `73/12=` at least `6` times
And it will decay by half each time.
So we can write
`42(1-0.5)^6`
`=42(0.5)^6`
`=42(0.015625)`
`=0.656` grams will be left after 73 days