What is the surface area of the right cone below?
D. 54rt units
A. 126units
B. 631 units
C. 991 units

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7

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:  

16 is the coefficient

hope this

a:

step-by-step explanation:

a