You are given a box of 100 silver dollars, all facing heads…

You are given a box of 100 silver dollars, all facing heads up. You are instructed to shake the box 3 times; after the second shake, you will remove all the dollars that are heads up before shaking again. You may keep all the dollars that are still tails up following the third shake. How many dollars will you most likely get to keep? (2 points)

Scientists estimate Earth’s age to be 4.6 billion years. Sam…

Scientists estimate Earth’s age to be 4.6 billion years. Samarium has a half-life of approximately 106 billion years. From the present date, approximately how many more years must pass before a sample of samarium that was created at the beginning of Earth’s history contains 50 percent of the original parent material? (2 points)

Scientists estimate Earth’s age to be 4.6 billion years. Sam…

Scientists estimate Earth’s age to be 4.6 billion years. Samarium has a half-life of approximately 106 billion years. From the present date, approximately how many more years must pass before a sample of samarium that was created at the beginning of Earth’s history contains 25 percent of the original parent material? (2 points)