Scientists dig up a lump of Co-60 weighing 15.25grams. Carbon-14 dating indicates that it has been in the ground for 35 years. If the half-life of Co-60 is 7 years, what was the original mass?

What are the advantages of using the metric system? designed as a decimal system making conversions simpler more accurate system of measurement has prefixes that correspond to an amount to use with all base units used by the entire scientific community