distance formula

How is the distance formula correctly written?

A(3,1) B(-2,-1) written correctly is:
Options:
1. $$\sqrt{\left(-2-3\right)^2\ +\ \left(-1-1\right)^2}$$
2. $$\sqrt{\left(1-3\right)^2\ +\ \left(-1-2\right)^2}$$
3. $$\sqrt{\left(-2-3\right)^2\ -\ \left(-1-1\right)^2}$$
4. $$\sqrt{\left(-2-3\right)^2\ -\ \left(-1-1\right)^2}$$

What is the slope of the following graph?

What is the slope of the following graph?

What is the slope between AB? Options: 0, 5, undefined, -5

Find the length of the missing side. Options: 17 cm, 22 cm, 15 cm, 13 cm

Simplify

Which letter matches the coordinate (4, -6)? Options: G, Z, K, None of the above

Which letter matches the coordinate (0, -6)? Options: O, L, i, Z

Find the direct distance between the court house and the town hall.