WHAT IS TRUE ABOUT THE HEIGHT OF THE RECTANGLE

7 is the median   7.875 is the mean

step-by-step explanation:

3,4,5,6,8,11,13,13

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 value of x is 28.2

simple 80 pieces in 1 sercing so 80*47=3760+20=3780