I am currently in a section of my geometry book titled Applying Properties of Similar Triangles. This is a very easy section but there is on problem where I cannot figure out (forgot) the next step.

Question

1. z-4    12
   --- = ---
   z/2    10

2.(z-4)10 = (z/2)12

3. 10z+40 = ?

Thank you for your time and your help would be appreciated a lot a lot a lot!!! :D please help

Reiny · Answer

from (z-4)10 = (z/2)12 10z - 40 = 6z take it from here.