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denis-greek [22]
3 years ago
5

What is the first bridge built?

Mathematics
1 answer:
Marat540 [252]3 years ago
4 0
Iron bridge is the first bridge to be ever built
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x = 45

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It will be 8 meters long.

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antoniya [11.8K]
<h2>angle in triangle</h2>

because the triangle above is an isosceles triangle, then both angles are of the same value.

and one thing you should know, the angle above shows the straight angle.

<em>so the sum of all angles is 180</em><em>°</em>

<u>can be written like </u><u>this</u><u> </u><u>:</u>

(5x+13)°+(3x+7)°=180°

5x + 13 + 3x + 7 = 180

8x + 20 = 180

8x = 180 - 20

8x = 160

x = 20

<em>(*the third choice is correct)</em>

3 0
3 years ago
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