Final answer:
The coefficient in the expression 5x + 3 is 5.
Step-by-step explanation:
In the expression 5x + 3, the coefficient is the number that is multiplied by the variable. In this case, the coefficient is 5. The variable x does not have a coefficient because it is understood to be multiplied by 1. The constant term in the expression is 3.
Learn more about Coefficient in algebraic expressions