Answer:
20. 4n+5+8n-5=180(linear pair)
12n=180
n=15
21. 9x-6=8.5x+2(can be seen from image)
9x-8.5x=2+6
0.5x=8
x=8/0.5
x=80/5
x=16
22. 4z+3z+6=90°(Complementary)
7z+6=90°
7z=84°
z=12°
It is A. Because .8 is the same has saying .80, it is .80>.79, and 80 is greater than 79
Answer:

Step-by-step explanation:
For any circle point with coordinate of center (a,b) and radius r
equation of circle is given by

_______________________________________
Given
coordinate of center = (-5,2)
radius = 6
thus, equation of circle can be written by substituting a and b with (-5 ,2) and r =6 as shown below

Thus, equation of circle is 
Answer:
3
Step-by-step explanation:
To find the average add all these numbers together, then divide by how many numbers you have.



Answer:
I think it's
B. UV radiation from the Sun causes overheating of transformers.
Sorry if i'm wrong.