Answer
$\frac{3}{5}$
Work Step by Step
$\frac{5}{6}(-\frac{9}{10})(-\frac{4}{5})=\frac{5\times-9\times-4}{6\times10\times5}=\frac{180}{300}$
$\frac{180}{300}=\frac{180\div60}{300\div60}=\frac{3}{5}$
The two negative signs in the numerator cancel out, so the resulting product is positive.
