Geometrymedium · Past Paper
Calculate the value of x if (5x - 5) and (2x + 10) are angles on a straight line.
A15
B25
C35
D45
✓ Correct Answer: B — 25
5x - 5 + 2x + 10 = 180; 7x + 5 = 180; 7x = 175; x = 25.
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