Please help me 21 question

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

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

Simplify the expression 10/11(22z) + (a+5) -1