Find the volume of a pyramid with a square base, where the area of the base is 6.5 m² and the height of the pyramid is 8.6 m. Round your answer to the nearest tenth of a cubic meter.

answer:   c ?

step-by-step explanation:

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:  

hey pal. the answer is b plz mark as brainliest