1. Given (12+3)x, we can sum the numbers in the parenthesis to get 15x
2. Given 12x+3x, we can factor x to get (12+3)x and get the same as 1.
3. Given (12+3x)x, we have to distribute the x and we have 
4. This expression is already simplified.
The answer is 9 guests total
Answer:
if -196 was positive, it could be 14 or -14, but because it is negative, it is considered infinity or unknown
we know that
The equation of the circle is of the form

where
is the center
is the radius
in this problem
we have


So
the center is the point 
the radius is
units
using a graph tool
see the attached figure