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Mathematics 13 Online
OpenStudy (anonymous):

ABCD is a trapezoid and EF=21. Find the value of x. (I will attach the picture)

OpenStudy (anonymous):

OpenStudy (anonymous):

[(0.5+1)+(x-4)]/2=21 1.5x -3 =21*2 x = (42+3)/1.5 x = 30

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