S = vt + 16t^2, solve for v.
\(S=vt+16t^2\ \ \ \ \ | subtract\ 16t^2\\\\ S-16t^2=vt\ \ \ \ \ | divide\ by\ t\\\\ \frac{S-16t^2}{t}=v\\\\\Solution\ is\ v=\frac{S-16t^2}{t}.\)