Simplify - 2.6c - 2.8c

With this question! what is process of elimination? ? p. s. my brothers acc got banned so add his new one @ yamauchiyamyam17

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

Let f(x) = x+3 and g(x) = 1/x the graph of (fog)(x) is shown below what is the range of (fog)(x)?