Final answer:
The correct expression is 3 × (18 + 2) - 100, which results in the value -40, representing 100 less than 3 times the sum of 18 and 2.
Step-by-step explanation:
The expression that represents 100 less than 3 times the sum of 18 and 2 is 3 × (18 + 2) - 100. First, we calculate the sum inside the parentheses: 18 + 2 equals 20. Next, we apply the multiplication by 3, which gives us 3 × 20 equals 60. Finally, we subtract 100 from 60, ending with 60 - 100 equals -40. Therefore, the correct expression and value are 3 (18 + 2) - 100; -40.