Skill Practice 5 Cesium-137 is a radioactive metal with a short half-life of 30 yr. In a sample originally having 2 g of cesium-137, the amount A(1) (in grams) of cesium-137 present after i years is given by A(1) = 2(4)/30. How much cesium-137 will be present after а. 30 yr? b. 60 yг? с. 90 yr?

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