geometry
posted by Tami .
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.
1. z4 12
 = 
z/2 10
2.(z4)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

from (z4)10 = (z/2)12
10z  40 = 6z
take it from here.