Trade winds in the southern hemisphere blow froma)east to westb) west to eastc) north to southd) south to north

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

What are the answers for the following questions?

The inner planets mercury, venus, earth, and mars were formed by