What is the value of X
2 answers:
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240 days is 4 times the half-life, which means that a sample of 1000 mg will decay to
after 240 days.
If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up (+1).
If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down (no change).
If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down (no change).