Question

simplfy the expression (8+7a)+4.....
a. 12+11a
b. 19a
c.8+11a
d. 12+7a
and could you explain how you do this type of problem

Answer 1

It is the same as:
8+7a+4
It is the same as:
8+4+7a
It is the same as:
12+7a

Answer 2

Thank you I have had a hard time figuring out how to do these type of equations

Answer 3

There is this thing called the associative property. That says, by rearranging the terms in an expression with additions, you don't change its value.

http://math.about.com/od/prealgebra/a/associative.htm

Answer 4

thank you again this is sometimes hard to remember