1. The problem asks why the product of 144 minus 91.80 and 52.20 is what it is. 2. First, clarify the expression: it means $(144 - 91.80) \times 52.20$. 3. Calculate the subtraction inside the parentheses: $$144 - 91.80 = 52.20$$ 4. Now multiply the result by 52.20: $$52.20 \times 52.20 = 52.20^2$$ 5. Calculate the square: $$52.20^2 = 2724.84$$ 6. So the product of $(144 - 91.80)$ and $52.20$ is $2724.84$. 7. This shows the product is the square of $52.20$ because the subtraction equals $52.20$. 8. In summary, the product equals $2724.84$ because $144 - 91.80 = 52.20$ and multiplying by $52.20$ squares that number.