The number of pepperoni slices that kim puts on a pizza varies directly as the square of the diameter of the pizza. if she puts 15 slices on a 10" diameter pizza, how many slices should she put on a 16" diameter pizza?

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?