Answer:
For this you have two tiranlges the small one up top and the big one. You know you have two parallel lines and two transversal. SO therefore you know that the small triangle is similar to the big triangle.
That means that your sides are proportionate. You should set up a proportion.
[tex]\frac{a}{b} =\frac{c}{d}[/tex]
Make sure you use the same side
72/ 56 = 9/ (3x-20)
or 72/9 = 56/(3x-20) Now once you have your proportion you can cross multiply and solve for x.
Good Luck!
Step-by-step explanation:
