Answer
$\dfrac{-12}{5y^4}$
Work Step by Step
Given: $\dfrac{4}{y^3} \times \dfrac{-3}{5y}$
$\dfrac{4}{y^3} \times \dfrac{-3}{5y}=\dfrac{4 \times (-3)}{y^3 \times (5y)}$
$=\dfrac{-12}{5y^4}$
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