Find the value of x in each case. 18 c
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check the picture below.

recall that angles that lie on a flat-line, namely linear angles, sum up to 180°, so the two siblings lying on that red line, is 5x and 180 - 5x.

180 - 5x, being the exterior angle at the vertex C, stemming from AC.

so, we have three exterior angles, since it's a triangle, 8x, 9x and (180 - 5x), let's bear in mind that the sum of all exterior angles is 360°.

If you check both images you can see that the answer is x = 15

the correct answer is 5 6 and 7