Answer:
C
Step-by-step explanation:
x = -1 and -7
Answer:20
Step-by-step explanation:
To solve this question, we have to find the equation of the circle with given center and where it passes. Doing this, we get that the equation of the circle is:

Equation of a circle:
The equation of a circle with center
and radius r is given by:

Center at (16, 30)
This means that 
Thus

Passes through the origin:
We use this to find the radius squared, as this means that
is part of the circle. Thus



Thus, the equation of the circle is:

For another example to find the equation of a circle, you can look at brainly.com/question/23719612
Given:
The equation is:

To find:
The logarithmic equation that is equivalent to the given exponential equation.
Solution:
According to the property of logarithm:

We have,

Here,
. By using the above property of logarithm, we get


Therefore, the correct option is C.