Calculate the amount, in grams, of an original 300 gram sample of potassium 40 remaining after 3.9 billion years. a. 300
b. 150
c. 75
d. 37.5​

Abucket full of water weights 4 kg and water well is 10m deep. a girl draws water from the well. it takes the girl 3 minutes to draw a bucket full of water from the well. what is the power of the girl?

What causes the formation of ocean currents?

In which type of system is power held solely by the central government and not shared with regional governments? group of answer choices federal unitary confederate oligarchic