Question

na figura,r//s//t.Determine a medida do segmento AB

Answer 1

$\dfrac{2x+1}{5x-1} = \dfrac{4}{6}\\\\ (5x-1)*4 = (2x+1)*6\\ 20x-4=12x+6\\ 20x-12x=6+4\\ 8x=10\\\\ x=\dfrac{10}{8}\\\\ x=1,25\\\\ AB=2x+1\\ AB=2*1,25+1\\ AB=2,5+1\\ AB=3,5$

Espero que tenha entendido!