b is between a and c if ab=2x+1 bc=3x+4 and ac=30 find x and ab

10th grade geometry
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1 Answer

ab+bc=ab . . . (2x+1) +(3x+4)=30 . . . 5x+5=30 . . . 5x=25 . . . x=5 . . . ab=2x+1=11
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