answers

A term is a single part of a math expression.

 For example, in the expression 

3x+4−2y, there are three terms: 3x, 4,−2y.

"Like terms" are terms whose variables (and their powers such as the 2 in x2) are the same. 

 For example, in the expression

 3p + 3p, both are the same

A coefficient number is multiplied by a variable in an expression.

 For example, in the expression

5𝑥, 5 is the coefficient.

A variable symbol (usually a letter) represents a number we don't know yet. 

For example, in the expression

x+2=5, 𝑥 is a variable.