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allochka39001 [22]
3 years ago
14

How do I do this? Please explain in detail.

Mathematics
2 answers:
umka2103 [35]3 years ago
8 0
22.5/(x-6) + 22.5/(x+6) = 9
multiply by x-6
=> (x-6)22.5/(x-6) + (x-6)22.5/(x+6) = 9(x-6)
=> 22.5 + (x-6)22.5/(x+6) = 9(x-6)
multiply by x+6
=> (x+6)22.5 + (x+6)(x-6)22.5/(x+6) = 9(x-6)(x+6)
=> (x+6)22.5 + (x-6)22.5 = 9(x-6)(x+6)
distribute
=> 22.5x+6(22.5) + 22.5x - 6(22.5) = 9(x^2 - 36)
=> 45x = 9x^2 - 9(36)
=> 0 = 9x^2 - 45x - 9(36)
divide by 9
=> 0 = x^2 - 5x - 36
=> 0 = x^2 - 5x - 36
=> 0 = (x - 9)(x + 4)
x=9 and -4
Neporo4naja [7]3 years ago
7 0
Https://us-static.z-dn.net/files/d39/8be32892e96d7954b568343588bbf6c2.jpeg

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4 0
3 years ago
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Mike thought of a number. He added to it to two other numbers. One of these numbers was 12 less than his number, the other was 1
Inessa [10]

Answer:

number 1  + number 2 + number 3 = 15

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Number 3 = x

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Check:

Number 1 = 17

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Answer is 5

Step-by-step explanation:

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3 years ago
What is the value of hin the figure below? In this diagram, ABAD ~ ACBD.
VashaNatasha [74]

Answer:

  F.  8

Step-by-step explanation:

The ratio of the long side to the short side is the same in similar triangles. The long side of triangle BAD is AD, which has length 20-4 = 16.

  BD/DE = AD/BD

  h/4 = 16/h

  h^2 = 64 . . . . . . . multiply by 4h

  h = 8 . . . . . . . . . . take the square root (matches selection F)

_____

<em>Comment on this geometry</em>

BD = √(AD·DC) is called the "geometric mean" of the segments AD and DC. This geometry has some other geometric mean relationships as well:

BC = √(AC·DC)

BA = √(AC·AD)

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3 years ago
Can u pls help me with this thanks
aleksandrvk [35]

<em>Hey</em><em>!</em><em>!</em><em>!</em>

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Midpoint segment plaese help shcolor in training
Paladinen [302]
Same as any other midpoint of line segment or two points, it is the average of the two points x and y coordinates...

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mp=(5, -2)
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