Answer:
i only know cos
cos0 = 8/9
Step-by-step explanation:
A: 
Multiply both sides by 12
Answer:
B: 
Multiply both sides by 2,

Multiply both sides by N,

Divide both sides by 7,
Answer:
C: 
Multiply both sides by 2,

Multiply both sides by N,

Simplify,
Answer: 
Hope I helped you!
Answer:
16,28,12
is ur answer hope its right
Answer:

Step-by-step explanation:
Question: 5 - 7(z+1) = 7(-9-3z)
We multiply the number in front of the bracket first, since that is multiplication.
--> 5 -7z -7 = -63 - 21z
--> -7z -2 = -63 - 21z
Now, we move all the z and all the numbers to each side.
--> -7z +21z = -63 +2
--> 14z = -61
--> z = -61/14
This cannot be simplified further, so z is -61/14.