Cesium-137 has a half life of 30 years. What percent of the radioactive cesium parent atoms will remain after 90 years?

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

plz give brainliest

the answer is 303.15 or 303

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