Final answer:
The result of evaluating 3x7-4÷2 is 19, while the result of evaluating 3(7-4)÷2 is 4.5.
Step-by-step explanation:
When evaluating 3x7-4÷2, we first perform the multiplication and division operations. Multiplying 3 by 7 gives us 21. Then, dividing 4 by 2 gives us 2. So, the expression becomes 21 - 2, which is equal to 19.
On the other hand, when evaluating 3(7-4)÷2, we first simplify the parentheses. Subtracting 4 from 7 gives us 3. Then, we multiply 3 by 3, which gives us 9. Finally, dividing 9 by 2 gives us 4.5.