What is the advantage of using function notation instead of using y?

Jose bought 20 shares of netflix at the close price of $117.98. in a few years, jose sells all of his shares at $128.34. how much money did jose make? a.) $192.50 b.) $207.20 c.) $212.50 d.) $224.60

What term makes it inconsistent y=2x - 4

Can someone me with the property questions for 12 13 and 14 plz