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OpenStudy (anonymous):
The four angles of a quadrilateral are given below. Solve for x. 2x + 14, x - 9, x + 19, 3x + 21
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OpenStudy (anonymous):
(2x+14)+(x-9)+(x+19)+(3x+21)=360 (angle sum of a quadrilateral = 360 degrees) 7x+45=360 7x=315 x=45
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