... example, in the expression 3 2 = 3 × 3 = 9, the number 9 is the square of the number 3. If we reverse the process, we can say that the number 3 is the square root of the number 9. The symbol for ... sets. The symbol for intersection is: ∩. For example, the intersection of the integers and the whole numbers is the set of the whole numbers itself. This is because the elements (numbers) that they ... 7, 8, and then, choose the middle values 3 and 5. Find the average of the numbers 3 and 5: ᎏ 3+ 2 5 ᎏ = 4. The answer is 4. The mode of a set of numbers is the number that occurs the greatest...