Carbon-11 is one of the radioactive isotopes of carbon with half-life period of 20 minutes. What fraction of the initial number of c-11 atoms in a sample will have decayed away after 80 minutes ?.

Can you me find area of the shaded region?

All businesses can discriminate against workers based on a nation of origin b. immigration status c. mental disability d ane

Scientists observed a rock stratum and discovered some fossils. the image shows the fossils they discovered. what can you interpret from the image? an illustration showing layers rock with fossils embedded in some rock layers1. the dinosaur and the mammoth existed after the trilobites.2. the dinosaur and the armored fish existed before the trilobites.3. the trilobites and the armored fish died before the dinosaur.4. the trilobites and the armored fish were born after the dinosaur.5. the early mammoth is older than the trilobites.