What is the surface area of a rectangle with the base 10 and the height 15

Any greatly appreciated! you in advance. 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's 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? a.$65.00b.$5288.00c.$210.00d.$310.00

Having a hard time understanding this question (see attachment).

Find the maximum value of p= 4x + 5y subject to the following constraints :