I could help when you are dealing wit a hidden variable and will help solve the question. The expression has no answer so it shows the work.
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for example, if you have 2x you can write it as : 2 times x or 2 multiplied by x.
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.
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Suppose the function is "multiply a number x by two then subtract three and divide the whole thing by five". The algebraic expression would be: f(x) = (2x-3)/5
You cannot write an algebraic expression for that, you need an equation. The equation is n - 6 = 4