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zimovet [89]
3 years ago
7

Please explain how it’s C?!

Mathematics
1 answer:
Zepler [3.9K]3 years ago
8 0
The equation of a circle centered at the origin is x² + y² = r², where r is the radius.

Because we know that the circle goes through point (0, -9), we know that the radius of the circle is 9, so the equation of the circle is x² + y² = 9² = x² + y² = 81.

Therefore, to see if the point (8, √17) lies on the circle, we need to substitute these coordinates into the equation:

x² + y² = 81
8² + (√17)² = 81
64 + 17 = 81
81 = 81

So this confirms that the point (8, √17) lies on the circle.

I hope this helps!
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For A(–3, 2), B(0, 7), and C(0, 2), find all locations of a fourth point, D, so that a parallelogram is formed using A, B, C, D
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Show that a^12 can be written as a perfect square and a perfect cube
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Answer:

Step-by-step explanation:

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a^12 = a * a * a * a * a * a * a * a * a * a * a * a

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a^12 = a * a * a * a * a * a * a * a * a * a * a * a

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Now do the same thing with groups of 6s

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3 0
3 years ago
(9c – 8d) + (2c – 6) + (–d + 3)=
Feliz [49]

Explanation: Just addition and subtraction which is easy, I'd remove the brackets first so it won't be too confusing.

9c-8d+2c-6-d+3=???

Here, just remember that:

  • Plus/Positive multiply Minus/Negative = Minus/Negative
  • Plus/Positive multiply Plus/Positive = Positive/Plus
  • Minus/Negative multiply Minus/Negative = Positive/Plus

Notice the +(-d+3), (+)(-) = - so it's -d+3

Now just addition and subtraction, for better looking and non-confusing.

9c+2c-8d-d-6+3=???\\9c+2c-8d-d-6+3=11c-9d-3

9c+2c = 11c

-8d-d = -9d

-6+3 = -3

Therefore, the answer is 11c-9d-3

If you are confused, you can reply to this explanation (If it's wrong, let me know.)

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What the characteristics of the absolute value
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The absolute value of a number is its number away from zero
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