Question

5(z+4)+5(2−z) How do I simplify this??

Answer 1

You have to expand the brackets by multiplying what is in forn of the brackets by everything inside them i.e.
5z+20+10-5z
Then you combine like terms:
30

Hope this helps :)

Answer 2

this is how it is done.

=5+20 + 10 - 5z
=5z -5z + 20+10
=30