Help ASAP
*8th-grade math*

i would say c is the best answer, hope it's right!

good luck! =)

cutie~

answer: your answer is c

step-by-step explanation:

13664

step-by-step explanation:

=cross multiply

=100 x = 13664

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: