Answer:
x = -9
Step-by-step explanation:
x = -y/4
y = -2(-y/4) + 18
y = y/2 + 18
y/2 = 18
y = 36
x = -36/4
x = -9
Answer:

Step-by-step explanation:
Having the radius to be involved, the shape is a circle.
<u>Circumference formula </u>

Finding radius, formula will be reversed.


(4^2)^8 would be the answer 4^2=16 and 16^8 is the same thing
Answer: 4.24264069
Step-by-step explanation: I think you mean the square root?