m angleS =22, m arc RS =82, & line RU is tangent to the circle at R. Find m angle U. (The figure is not drawn to scale.)​

b is the final answer! : )

i agree because i see the other persons thinking is clear

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:  

c. he organized a political resistance group based on islam.