-0,25y*8b

To simplify the expression \(-0.25y \cdot 8b\), you can multiply the coefficients and combine the variables:

1. Multiply the coefficients: \(-0.25 \cdot 8 = -2\).

2. Combine the variable terms: The expression will include \(y\) and \(b\).

Putting it all together, the expression simplifies to:

\[ -2yb \]