Answer:
The equation of the given circle is X²+y²+4x- 12y+15=0
Area of a rectangle = length (l) * width (w)
A = 30ft * 20ft
A = 600 sq ft
Now the width of a sidewalk that surroundeds it = 3 ft
so now the area of the rectangle with sidewalk= 30+3ft * 20+3ft
A = (33*23) ft
A = 759 sg ft
Area of the sidewalk = 759 - 600
A = 159 sq ft
Answer:

Step-by-step explanation:
Taking the terms one at a time,


Adding the terms, you have;

Hope it helps!
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Hard to awnser a question if i cant understand what you are saying
Answer:
Step-by-step explanation:
y + 3 = 7(x - 1)
y + 3 = 7x - 7
y = 7x - 10