Is there a way to see how many points you have earned for one day. For example, would I be able to see how many points I have earned TODAY.

Long ago, people who lived in coastal north africa most often interacted with

Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite

Does anyone know the answers for these