1. Which polygon or polygons are regular?
A regular polygon is a polygon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length).
Therefore your answer is:
A. equilateral triangle
C. square
2. Which polygon is always irregular?
traingle - NOT (equilateral triangle)
trapezoid - YES
square - NOT
hexagon - NOT (regular hexagon)
The formula of a slope:

We have the points (-4, -3) and (-3, s) and the slope m = 3. Substitute:
I think it is D ... I am very sorry if I am wrong :)