Final answer:
The expression 3x + 10y + 5 is not a constant but an algebraic expression.
Step-by-step explanation:
The given expression, 3x + 10y + 5, is not a constant but an algebraic expression. A constant is a number that does not change value. In the expression 3x + 10y + 5, the variables x and y are not defined, so it cannot be simplified or evaluated further.