A sample of a radioactive isotope has ¼ of its original activity after 36 days. What is the half life of this isotope?

Explain how plate tectonics have changed earth’s surface over time. include the role of plate tectonics in the creation of landforms.

An object's buoyant force and weight mean the same thing.a. trueb. false

Atruck driver is attempting to deliver some furniture. first, he travels 8 km east, and then he turns around and travels 3 km west. finally, he turns again and travels 13 km to his destination. what is the drivers distance