Question

Find the value of x. The diagram is not to scale.

Answer 1

X=15 its simple since there's base angles and straight angle

Answer 2

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Isosceles triangle 
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∠STR = ∠SRT = 5x - 30

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Adjacent angles on a straight line is 180°
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∠STR + ∠ STU = 180°

(5x - 30) + 5x = 180
5x - 30 + 5x = 180
10x - 30 = 180
10x = 180 + 30
10x = 210
x = 21

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Answer: x = 21
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