monica2271 monica2271

17-01-2021
Mathematics

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Here is an easy one

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hayley554 hayley554

17-01-2021

Remember that the angles of a triangle is 180 so:

(7x+8) + (5x+2) + (7x-1) = 180
7x+8+5x+2+7x-1=180
7x+5x+7x=180-8-2+1
19x=171
X= 171/19
X=9

Therefore x=9

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Аноним Аноним

20-02-2021

Answer:

9

Step-by-step explanation:

done in other question of yours

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