Using the Pythagorean identity, the value of the cosine ratio is 
<h3>How to determine the cosine ratio?</h3>
The given parameter is:
By the Pythagorean identity, we have:
So, we have:
This gives
Evaluate
Take LCM
This gives
Take the square root of both sides
Cosine is positive in the fourth quadrant.
So, we have:
Hence, the cosine value is
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7 mm x 9mm x 12mm = 756mm
To get this answer you have to multiply 9 and 12 which would be 108. Then you have to divide 108 on both sides to get mm by itself. 756 divided by 108 is 7 which is the answer!
Simple....
x<6
This means that on your graph at 6 it's a circle (not colored in) and it goes to the left indefinitely...
Thus, your answer.
C - (x-3)^2=36
If we expand (x-3)^2=36:
(x-3)(x-3)=36
x^2-3x-3x+9=36
x^2-6x+9=36
Then subtract 36
x^2-6x-27=0
