Respuesta :

[tex]\begin{gathered} m=\frac{b}{f} \\ we\text{ will make b the subject of the formula:} \\ \mu\text{ltiply each side by 'f', we have:} \\ m\cdot f=f\cdot\frac{b}{f} \\ b=m\cdot f \\ b=mf \end{gathered}[/tex]