4 of 10
What fraction of an hour is 5 minutes?
Give your answer in its simplest form.

1/12

Step-by-step explanation:

an hour is 60 minutes, so the fraction would be:

5/60.

simplified, the answer would be:

1/12.

(just divide 5/60 by 5)

b. hannah is playing with her cousin at

ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

source: