Write the equation of each circle. 1. Circle X centered at the origin with radius 10
2. Circle R with center R(-1, 8) and radius 5
3. Circle P with center P(-5, -5) and radius 2/5
4. Circle O centered at the origin that passes
through (9.-2)
5. Circle B with center B(0.-2) that passes
through (-6.0)

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).