Which are the center and radius of the circle with equation (x + 5)2 + (y − 4)2 = 9?

The center of the circle is at: C=(−5,4).

The radius of the circle is r=3.

Step-by-step explanation:

Elevation of city D is half the elevation of city C, It is given that the evelation of city C is 12 feet above the sea level level. Hence elevation of city D=12/2=6feet above the sea level. This is the answer to part A The elevation of city D=x/2, where x is the elevation of city C in feet. For part B write, here x=12 hence x/2=6 Therefore the elevation of city D is 6feet above the sea level.
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