The discriminant must be non-negative: 2^2 - 4*1*k >= 0, thus k <= 1.

For equal roots, the discriminant must be zero: 4^2 - 4*1*k = 0, thus k = 4.

2y - 7 = 13 => 2y = 20 => y = 10.

4z + 8 = 32 => 4z = 24 => z = 6.

5m + 15 = 45 => 5m = 30 => m = 6.

6a + 4 = 28 => 6a = 24 => a = 4.

8b + 16 = 48 => 8b = 32 => b = 4.

If A > B and B > C, then by transitive property, A > C is true.

Since A < B and B ≤ C, it follows that A < C.

From A ≤ B and B < C, we can conclude A < C.

Since D = E and E > F, it follows that D > F.

From M ≥ N and N > O, we can conclude M > O.

Since Q = R and P > Q, it follows that P > R.

Since P ≤ Q and Q < R, it follows that P < R.

The sum of the roots is -b/a = -3/1 = -3.

The equation can be factored as (x+3)(x+3)=0, hence the root is -3.

Since Y = Z and X > Y, it follows that X > Z.

Since Y = Z, and X < Y, it follows that X < Z.

10x - 10 = 0 => 10x = 10 => x = 1.

7x - 3 = 18 => 7x = 21 => x = 3.

Factoring gives (x-3)(x+3)=0, hence the roots are -3 and 3.

Factoring gives (x-2)(x-5)=0, hence the roots are 2 and 5.

5x + 2 = 17 => 5x = 15 => x = 3.

9y - 5 = 22 => 9y = 27 => y = 3.