Is x equal to 1/x^-1 ? show process

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0