What is the difference of the y-coordinate of point a and the y-coordinate of point b part e ?

i not know

step-by-step explanation:

i am thinking c. sorry if im wrong .

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:  

1/4 is the asnwer cuz 5/20 is the faction