Y = mx + b...subtract b from both sides
y - b = mx...now divide both sides by x
(y - b) / x = m
Answer:
Option (3). 72°
Step-by-step explanation:
Angle of rotational symmetry = Central angle of a polygon
That means when we rotate the regular polygon by a central angle, polygon overlaps itself.
Central angle of a polygon with n sides = 
Where n = number of sides of the polygon
Therefore, central angle of a polygon with 15 sides = 
= 24°
Central angle tells us that after every 24° of rotation, polygon overlaps itself.
Angle of rotational symmetry may be 48°, 72°, 96°.....
Therefore, Option (3) is the possible angle of rotational symmetry.
12/18
6/9
2/3
Simply in common factor you know and keep doing it
12/18
BCD:6
2/3
I don’t know if this is what you’re asking but 14.1-191 = -176.9