Answer:
-1
Step-by-step explanation:
Looks like 14.4 because you have to add them all together and divide by the total numbers
(20+22+10+5+15)/ 5
2x^2+8xy+8y^2
2(x^2+4xy+4y^2)
A circle with center
and radius
has equation

If we substitute
in this equation, we have

This equation has two solutions (i.e. the line intersects the circle in two points) if and only if the determinant is greater than zero:

The expression simplifies to

The solutions to the associated equation are

So, the parabola is negative between the two solutions:
