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Question

The three angles (5x+4), (x2) and (3x+7) forms a straight angle.

Find the value of x.


A

22.

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B

21.

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C

19.

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D

20.

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Solution

The correct option is C

19.


Straight angle =180

(5x+4)+(x2)+(3x+7)=180.

(5x+x+3x)+(42+7)=180.

(9x+9)=180.

9(x+1)=180.

(x+1)=20.

x=201.

x=19.


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