SOLUTION: expressions/53089 (2006-09-21 00:55:06): I need to justify each of these step, please help me with this. 5(n+4)+9n= (5n+20)+9n =5n+(20+9n) =5n+(9n+20) =(5n+9n)+20 =(5+9)n+20

Algebra ->  Distributive-associative-commutative-properties -> SOLUTION: expressions/53089 (2006-09-21 00:55:06): I need to justify each of these step, please help me with this. 5(n+4)+9n= (5n+20)+9n =5n+(20+9n) =5n+(9n+20) =(5n+9n)+20 =(5+9)n+20      Log On


   

Question 53090: expressions/53089 (2006-09-21 00:55:06): I need to justify each of these step, please help me with this.
5(n+4)+9n= (5n+20)+9n
=5n+(20+9n)
=5n+(9n+20)
=(5n+9n)+20
=(5+9)n+20
=14n+20
Answer by mathchemprofessor(65) About Me  (Show Source):
You can put this solution on YOUR website!
5(n+4)+9n= (5n+20)+9n
You're asked to justify the left hand expression equals right hand expression, but not to simplify.
On simplification of each side, we get 14n+20