You emptied a cylindrical shark tank at the aquarium to clean it. The aquarium has a radius of 13 feet and a height of 18 feet. In cubic feet, about how much water is needed to refill the tank after cleaning?

4.6875 pounds

step-by-step explanation:

5x+10 is the correct one

hope this

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: