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natta225 [31]
3 years ago
10

Write and solve an equation to find the value of x. Show your work.

Mathematics
1 answer:
brilliants [131]3 years ago
8 0

Answer:

x = 9

Step-by-step explanation:

(13x + 2) + (5x -7 ) + (3x-4) = 180°( sum of angles in a triangle)

13x + 2 + 5x - 7 + 3x - 4 = 180

13x + 5x +3x + 2 - 7 - 4 = 180

21x - 9 = 180

add 9 to both sides

21x - 9 + 9 = 180 + 9

21x = 189

Divide through by 21

x = 9

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The perimeter of a shape is the sum of the lengths of its sides.

So, to find the perimeter of this quadrilateral, all we have to do is add the side lengths and simplify.

(x² - 6) + (2x + 5) + (x² - 3x) + (4x² + 2x)

x² + x² + 4x² + (-3x) + 2x + 2x + (-6) + 5

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So, the perimeter of the quadrilateral is the quantity (6x² + x - 1).

Hope this helps!

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allochka39001 [22]

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3 years ago
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strojnjashka [21]
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4 0
3 years ago
Danny scored 10 points in the first round of a game. he then lost 20 points in the second round. in the final round he earned 40
Black_prince [1.1K]
Danny's score at the end of the game is 30 because:
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Answer:

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