3. Strontium-90 is used in machines that control the thickness of paper during the manufacturing process. Strontium-90 has a half-life of 28 years. After 840 days, approximately how much of the original 1200g sample remains? Round to the nearest whole number. sin LÁTEX sans LATEX free 1 A, = A, STUDIO AL Ao Elapsed time Half life of isotope Amount of the isotope left Original amount of the isotope

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