Final answer:
The constant term in the expression 6x^3y + 7x^2 + 5x + 4 is 4, as it is the only term without a variable.
Step-by-step explanation:
The constant term in a polynomial expression is the term that does not contain any variables. In the expression 6x3y + 7x2 + 5x + 4, terms with variables are 6x3y, 7x2, and 5x.
These are not constant terms because their values change with the variables x and y.
The term 4 is the only term without a variable, making it the constant term in the given expression.
Thus, the constant term in the expression 6x3y + 7x2 + 5x + 4 is 4.