# How do you identify the terms, like terms, coefficients and constants in each expression a+1+2a+8a?

The terms of an expression are the things separated by the plus and minus signs. In this case, they would be $a , 1 , 2 a ,$and $8 a$.
The coefficients of an expression are the numbers that precede the variable in the expression. In this case they would be $1$ (since $a = 1 a$), $2$ and $8$.
The constants of an expression are the numbers which do not have a variable next to them. In this case, they would be $1$.