In the expression 5 + y + 8, y is a variable. We know how much 5 and 8 are, those are definite quantities. Only y has an unknown, and hence variable value.
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The coefficient is the number in front of the variable a, or 5.
In the expression 5x + 3, the coefficient is 5.
As an algebraic expression it is simply: 6t+5
5
It is an algebraic expression which equals a + 28.