Respuesta :

Answer:

DF=126 units

Explanation:

E is the midpoint of DF.

[tex]\begin{gathered} DF=2\times DE \\ 19x-7=2(9x) \\ 19x-7=18x \\ 19x-18x=7 \\ x=7 \end{gathered}[/tex]

Therefore:

[tex]\begin{gathered} DF=19(7)-7 \\ =133-7 \\ =126 \end{gathered}[/tex]

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