Posted by Elysa on Tuesday, March 20, 2012 at 9:32am.
Simplify the following expression:
2(4y + 5z)  10z

Algebra  drwls, Tuesday, March 20, 2012 at 10:23am
Let's see you try it first. If you don't understand these concepts, you need a private tutor.
(1) Multiply terms inside parentheses by the outside factor (2).
(2) Combine "like" terms. (In this case, there will be two terms that end withy z)
(3) You will note that two "z" terms are equal and opposite in sign. So the "z" terms disappear. 
Algebra  malika, Tuesday, March 20, 2012 at 12:46pm
2(4y+5z)10z
=8y+10z10z
=8y Answer
+10z and 10z cancel out as they are opp signs