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Agata [3.3K]
3 years ago
9

Surface area 20 points

Mathematics
1 answer:
shepuryov [24]3 years ago
3 0

Answer:

612 m^2.

Step-by-step explanation:

Area = area of 3 rectangles + area of 2 triangles

= 15 * 14 + 9 * 14 + 12 *14 + 1/2 * 9 * 12 + 1/2 * 9 * 12

= 210 + 126 + 168 + 54 + 54

= 612 m^2.

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 1.              x -    4
x - 6|x² - 10x + 24
     - (x² -  6x)
               -4x + 24
             - (4x + 24)
                          0
The answer is C.

2. A. 9x² + 12x - 3
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        3(x² + 4x - 1)

    B. 9x² + 3x - 5
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        2(3x² + 6x - x - 2)
        2(3x(x) + 3x(2) - 1(x) - 1(2))
        2(3x(x + 2) - 1(x + 2))
        2(3x - 1)(x + 2)

    D. 6x² + 7x - 6
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The answer is C.

3.                  3x³ - 4x² + 3x - 6
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                                    - (-6x - 12)
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The answer is A.
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