## Elementary Algebra

$-24.3$
The product of a positive real number and a negative real number is a negative real number. We convert the decimal into a fraction for ease of simplification: $(9)(-2.7)$ =$\frac{9}{1} \times-\frac{27}{10}$ =$\frac{9\times-27}{10}$ =$\frac{-243}{10}$ =$-24.3$