Answer:
-11
Step-by-step explanation:
Given

Use properties:

Thus,

The number is 'n'.
Five times the number is 5n .
Nine more than that is 5n + 9 .
Answer: a. Radius of circle = 
b. The equation of this circle :
Step-by-step explanation:
Given : Center of the circle = (3,10)
Circle is passing through (12,12).
a. To find the radius we apply distance formula (∵ Radius is the distance from center to any point ion the circle.)
Radius of circle = 
Radius of circle = 
i.e. Radius of circle = 
b. Equation of a circle =
, where (h,k)=Center and r=radius of the circle.
Put the values of (h,k)= (3,10) and r=
, we get
∴ The equation of this circle :
No 1.2 x 2.6 doesn't equal 31.2 it equals 3.12