ASAP PLZ The table shows the amount of radioactive element remaining in a sample over a period of time. Radioactive Decay Rate Amount of Radioactive Sample (grams) Time (years)
56.0--0
47.1---400
39.6--800
33.3 --1,200
281,600
Part 1: What is the half-life of the element? Explain how you determined this. Part 2: How long would it take 312 g of the sample to decay to 9.75 grams? Show your work or explain your answer.

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

Which type of fossil does this image depict?

Adilute aqueous potassium nitrate solution is