Guys! i have one more question left. i am giving 15 points. answer! you!

For which rational expression is -2 an excluded value of x

Which of the following is the correct solution to the linear inequality shown below? y< 1/2x-4

The discrete random variables x and y take integer values with joint probability distribution given by f (x,y) = a(y−x+1) 0 ≤ x ≤ y ≤ 2 or =0 otherwise, where a is a constant. 1 tabulate the distribution and show that a = 0.1.2 find the marginal distributions of x and y. 3 calculate cov(x,y).4 state, giving a reason, whether x and y are independent. 5 calculate e(y|x = 1).