Can Anyone Give Me The Definition (Maths Definition) Of Equation, Formula, Identity, Expression And Term?

Equation - 2x+4=10

is and equation because you are finding the vale of x (only work to this value). Also there is a equal sign

Formula - d=w/4+10

is a formula because you need to work out d. Also there is two unknowns

Expression - 2x+3

is an expression because it is a algebra phrase

Identity - 2 (2x+3)

is an identity because it is the same for any value of x