How are exponents and powers different?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Aright cylinder has a diameter of 8 m and a height of 6m. what is the volume of the cylinder

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?