What is the missing angles of #9 and #11

#9-   93 degrees

#11- 65 degrees for both.

Step-by-step explanation:

#9- 40+47=87    180-87=93

#11- 180-50=130     130 divided by 2 = 65   you can tell both angles are the same because each one missing a number has the same number of curved lines in it!

the formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. if a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8