What is the value of (Negative three-fourths) Superscript negative 4? Negative 256 Over 81
Negative 81 Over 256
81 Over 256
256 Over 81

-9

step-by-step explanation:

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:  

4n=2m

ratio of m to n: 2/4 = 1/2

answer

a. 1/2