Final answer:
The expression that does NOT represent the product of 3 and 7 is option A: 3.7.
Step-by-step explanation:
The expression that does NOT represent the product of 3 and 7 is option A: 3.7.
This is because 3.7 represents the decimal number 3.7, which is not the same as the product of 3 and 7.
The correct representation of the product of 3 and 7 is option D: 3 x 7.