Which of the following is the additive inverse of ˉ4?
A. ˉ1⁄4 B. 0 C. 1⁄4 D. 4

step-by-step explanation:

kjswgdkxg

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:  

the answer is z7+8/5

the square root of 16 is 4.

4*4 = 16