U1.55.22
A square has a perimeter of 12x + 52 units. Which expression represents the side length of the square in units?
Ox+4
O x + 40
O 3x + 13
3x + 43
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Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

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