Final answer:
The expression that represents 5 times the sum of r and s is (r + s) x 5, where you first calculate the sum within the parentheses before multiplying by 5.
Step-by-step explanation:
The question asks which of the following expressions represents 5 times as much as the sum of r and s. The correct expression is (r + s) x 5. This is because the parentheses indicate that you add r and s together first before multiplying the sum by 5. Without parentheses, as seen in other options, the operations would not be performed in the correct order according to the rule of operations.