Final answer:
The degree of the algebraic expression 12y³+3 is 3, which is the highest exponent of the variable in the expression.
Step-by-step explanation:
The student has asked to write down the degree of the following algebraic expression: 12y³+3.
The degree of an algebraic expression is the highest sum of the exponents of the variables in a term of the expression.
In this case, the term with the highest exponent is 12y³.
Therefore, the degree of the expression 12y³+3 is 3.