2.) Which number is closest to 41.3 * O 41.31 O 41.29 O 41.031 O 41.302 O Other

The answer is(41.29)

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:  

the closest answer i got was 75 divided by 9 = 8.3

8 pages of sport cards 9 sports cards on each page

hope that