A number cube is labled 1 through 6. What is the probability of NOT rolling a 4

144.50

step-by-step explanation:

21.5 x 13.4=288.10 divide by 2

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:  

dwlovesminecraft is correct it is 2210.412.