Answer:
The required expression is
.
Step-by-step explanation:
Consider the provided sentence.
"Add the product of 3 and 6 to 4".
Product of 3 and 6 can be written as:

Now we need to add this product to 4.
Thus the required expression for "Add the product of 3 and 6 to 4" is:

Hence, the required expression is
.