7(2a+1) -4 (8a+3) plz help

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)

Biggest exam of the which of the following are polynomial functions?

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?