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OpenStudy (anonymous):
ABCD is a trapezoid and EF=21. Find the value of x. 18 23 25 30
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OpenStudy (anonymous):
OpenStudy (anonymous):
[(0.5x+1)+(x-4)]/2=21 [1.5x-3] = 21*2 x= (42 +3)/1.5 x=30
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