Blog

Kylie kept 100 grams of radioactive bismuth in a container. She observed the amount of bismuth left in the container after regular intervals of time and recorded them in the table shown below.   Time (seconds) Amount of bismuth in container (in grams) 0 100 60.5 50 121.0 25 181.5 12.5 Based on the observations, which of these is most likely Kylie’s inference? (4 points)

A political analyst observes that a country’s economy is primarily organized around customs and historical precedent, with occupations passed down through families. There is little economic development. This system is best identified as a:

Scenario: A small bakery has 4 workers. At first, each worker makes a full loaf from start to finish (mixing, kneading, shaping, baking, and packaging). The owner then reorganizes production so that one worker only mixes dough, one only kneads, one only bakes, and one only packages. After the change, the bakery produces more loaves per hour with the same number of workers and ovens.  Which explanation best accounts for the increase in output?

The appearance of living systems on Earth from non-living molecules is called (4 points)

Scenario (PPF): An economy can produce consumer goods (C) and capital goods (K). The table below shows points on its PPF (per year): Point A: C = 100, K = 50 Point B: C = 90, K = 65 Point C: C = 75, K = 80 If the economy moves from Point A to Point B, what is the opportunity cost of producing 15 more capital goods?

The scientific methods used to date fossils should be (4 points)

The diagram below shows horses in different periods of time on Earth. Based on the diagram, it can be concluded that horses have (4 points)

Creativity helps scientists (4 points)

Iodine-131 has a half-life of 8 days. In how many days will a 1 kg sample of iodine-131 decay and reduce to 0.0625 kg of iodine-131? (4 points)

The diagram below shows a portion of the geologic time scale. Based on the time scale, it can be concluded that (4 points)