Multiply. \( \begin{array}{l}-1.6 y\left(-2 y^{7}\right) \\ -1.6 y\left(-2 y^{7}\right)=\square \quad \text { (Simplify your answer.) }\end{array} \)

To multiply the expressions, you first handle the coefficients and then the variables separately. For the coefficients: \(-1.6\) multiplied by \(-2\) equals \(3.2\). For the variables: \(y\) multiplied by \(y^{7}\) gives you \(y^{1+7} = y^{8}\). Putting it all together, we get: \(-1.6 y\left(-2 y^{7}\right) = 3.2 y^{8}\). So the simplified answer is \(3.2 y^{8}\).