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She declares, "I guess you went shopping about three days ago." How does she know this?
It's simple: You must have started with a total of 80 chips, because you now have 70 10 = 80 total additives to your ice cream.
As an analogy, say you find yourself wondering, "How warm (or cold) is it outside?
" What you're actually looking for here is the temperature, which is fundamentally a description of how quickly molecules in the air are moving and colliding with one another, translated into a convenient number.
You have a sneaky, but not especially clever, roommate who doesn't like the ice cream itself, but cannot resist picking out eating the chips – and in an effort to avoid detection, he replaces each one he consumes with a raisin.Scientists interested in figuring out the age of a fossil or rock analyze a sample to determine the ratio of a given radioactive element's daughter isotope (or isotopes) to its parent isotope in that sample.Mathematically, from the above equations, this is N/N The trick is knowing which of the various common radioactive isotopes to look for.The method is also technically challenging because lead can "leak" out of many types of rocks, sometimes making the calculations difficult or impossible.U-Pb dating is often used to date igneous (volcanic) rocks, which can be hard to do because of the lack of fossils; metamorphic rocks; and very old rocks.