a researcher claims that an ancient scroll originated from greek scholars in about 500 b. c. its carbon-14 decay rate is 89% of that found in living organisms. how old is the scroll? (the half-life of carbon-14 is 5730 yr.)

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.

Rick is on a bicycle trip. every 4 days he bikes 230 km. if rick keeps this same pace for 16 days, how many kilometers will he bike?

If you are in grade when should you start studying for exams