Question

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Answer 1

20

Explanation:

the pair angles = same side interior angles:

(3x-10)° + (5x+30)° = 180°

(3x + 5x - 10 + 30)° = 180°

(8x + 20)° = 180°

8x° = (180 - 20)°

x = 160° ÷ 8°

= 20