What’s the answer I’m confused

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?

Jody bought 20 shares of amazon at the close price of $121.00. she bought 20 more shares a year later at the price of $127.00. two years later, she sold all of her shares at the price of $133.00. her broker charges $50 for each transaction. after all of these transactions, how much money did jody make?