Idk about the other 2, but the answer to 20 is 270 ft
Answer: Addition Property
Step-by-step explanation:
The difference between steps one and two is that the -9 is added to the other side to isolate 5x. (added- addition property)
Given a regular 20-gon ( a 20 sided polygon )
The measure of each interior angle will be given by:

where n is the number of sides
Substitute with n = 20
So, the measure of each interior angle =

The sum of exterior angles = 360
So, the measure of each exterior angle = 360/20 = 18
Answer:
c
Step-by-step explanation:
all real values of x where 1 < x < 4