Variable- a letter that represents an unknown number
eg. x, a, n
Expression- any single number, variable or a combination of operations (+,-,x, /) involving numbers and variables
eg. 5, n, 8t, x+1,, 2y-7
Value- a known or calculated amount
Constant- a number that does not change and increases or decreases the value of an expression
Numerical Coefficient- a number that multiplies the variable
eg.