Two more than 4 times a number is at most 10

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

Issof claims that the scale factor is 1/2. which statement about his claim is correct

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