Final answer:
The expression 3(3 + 4) simplifies to 21, and 3³ simplifies to 27. Since 21 is less than 27, the correct symbol to compare these expressions is <.
Step-by-step explanation:
To compare the expressions 3(3 + 4) and 3³, we must first simplify each expression. The first expression is a simple multiplication problem where we add the numbers in the parentheses first, so it becomes 3 * 7 which is equal to 21. The second expression is an exponent indicating that the number 3 is multiplied by itself three times, so 3 * 3 * 3, which equals 27.
Now that we have simplified both expressions, we can compare them:
Since 21 is less than 27, the correct symbol to place between the expressions is <.