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°
Here is your answer

REASON:

: The opposite sides of a parallelogram are equal.
So, in above given figure

(measures of opposite sides)




HOPE IT IS USEFUL
Answer:
if you're talking about slope intercept then
y= 8/5x + 11/5
Answer:
8/9
Step-by-step explanation:
8/9 has a repeating decimal of 8. No matter how many times you divide it, you will get the answer 0.8888 and to infinty.
4 times 7 gets 28 and 7-4 gets you 3