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satela [25.4K]
3 years ago
5

VERY URGENT HAVE A TEST TO TAKE

Mathematics
1 answer:
Daniel [21]3 years ago
5 0
The easiest way is to try the point (-4,1), that is, x=-4, y=1,
to see which equation works.
b works.

The usual way to do it is to find the equation of the circle
standard form of a circle is (x-h)²+(y-k)²=r², (h,k) are the coordinates of the center, r is the radius. 
in this case, the center is (-2,1), so (x+2)²+(y-1)²=r²
the given point (-4,1) is for you to find r: (-4+2)²+(1-1)²=r², r=2
so the equation is (x+2)²+(y-1)²=2² 
expand it: x²+4x+4+y²-2y+1=4
x²+y²+4x-2y+1=0, which is answer b.

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valentina_108 [34]

Answer:

22 groups of ten

Step-by-step explanation:

121 plus 116 = 237

237 - 9 = 228

lets split 228 into parts

200

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20 groups plus 2 groups = 22

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this probobly isn't the easiest way but I don't know how but this is my thought process.

8 0
3 years ago
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Tcecarenko [31]

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4 0
3 years ago
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Vlada [557]

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Step-by-step explanation:

7 0
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Answer:

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4 0
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