1. The problem is to find the sum of the numbers 7, 8, and 9. 2. The formula for the sum of numbers is simply adding them together: $$\text{Sum} = a + b + c$$ 3. Substitute the given numbers into the formula: $$\text{Sum} = 7 + 8 + 9$$ 4. Calculate the sum step-by-step: $$7 + 8 = 15$$ $$15 + 9 = 24$$ 5. Therefore, the sum of 7, 8, and 9 is $$24$$. This means if you add 7, 8, and 9 together, you get 24.