Which discribes all decimals that are rational numbers the decimal repeats and does not terminate
the decimal neither terminated nor repeats
the decimal terminates or repeats
the decimal terminates and does not repeat

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:  

answer: approximately 2.878

step-by-step explanation:

you multiply 11 and pi (3.14) then after you have 34.54. the final step is to divide by 12. the final answer is approximately 2.878