s - 20
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It is 2n + 20.
Let the number be x and so the expression would be: x+20
Numerical Expression: 1.) 20+2-8 ( Or any other number with two symbols on math ) Algebraic Expression: 2.) h x 2 ( Or any other number using only one symbol an a letter ) The difference between a numerical and algebraic expressions is that numerical expressions use only numbers, but algebraic expressions use letters as variables to represent numbers.
13 + a + 7 = 5 + b - 20. This assumes the two numbers are different.
20 - 4h is an algebraic expression in one variable, h. It cannot be solved since it is not an equation nor an inequality; it cannot be evaluated without any information about h.