The unknown number is 1/2 or 0.5.
ex: 4x+6=8
Answer:
The correct option is 'c' <em>cross-multiplication</em>
Step-by-step explanation:
Answer: (x+7)^2 + (y-4)^2 = 121 or (x+7)^2 + (y-4)^2 = 11^2
Step-by-step explanation:
Equation of the circle is:
, which is the center
and the radius 
-Place the center (-7,4) and radius 11 onto that equation:
(if simplified radius needed)
or

17
it's 17+(-7)=10
i hope that answers your problem