Elvis worked for 3 days and he was paid for 2,100. in how many days did he work if he received 4,900?

Need solving this 2nd limit problem.

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).

The value of 3^4 + 5 times 5 answer ! 50 points whoever answers correctly