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1 answer:
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Answer:
Curved parenthesis for negative infinity. Square bracket for the -0.12
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Explanation:
The inequality is the same as
This says that x is larger than negative infinity, but smaller than or equal to -0.12
Put another way: x is between negative infinity and -0.12, x could also equal -0.12
To write this in interval notation, we would say
We always use a curved parenthesis for either infinity. The square bracket indicates "include this endpoint as part of the interval".
Answer:
1. Centre = (1,-3); r = 2;
2. Centre = (2,-1); r = 4
Step-by-step explanation:
1. (x - 1)² + (y + 3)² = 4
The centre-radius equation for a circle is
(x - h)² + (y - k)² = r²
The centre of the circle is at (h, k) and the radius is r.
By comparing terms in the two equations we see that
h = 1, k = -3, r = 2
Centre = (1,-3); r = 2
2. (x - 2)² + (y + 1)² = 16
Here,
h = 2, k = -1, r = 4
Centre = (2,-1); r = 4
The figure below shows the first circle in red and the second in green.
