A closed circle means that value is included, and an open circle means that value is excluded.
Example:
x > 2 ---- Graphed with an open circle, everything greater than but not including 2
x ≤ 3 ------ Graphed with a closed circle, everything less than and including 3
Answer:
The value of x is 
Step-by-step explanation:
we know that
Applying the tangent-secant theorem

substitute the values and solve for x



using a graphing tool
to solve the quadratic equation
The solution is 
see the attached figure
X + y = 20---- 1
x - y = 8----- 2
From 1+2
2x = 28
x = 14
Substitute x in eq.2
14 -y = 8
y = 6
Ans : x= 14 , y= 6
Answer:
I'm confused
Step-by-step explanation:
what is it