how much of a 500 g sample of potassium-42 is left after 62 hours? the half life of k-42 is 12.4 hours

The gulf stream is a warm water current that flows away from the equator to northern europe. witch of these does it cause. a. crashes of warm and cool water in the ocean b.colder climates near the equator c.large waves on the cost of europe d.warm climates in northern europe