TeX source:

\frac{\mathrm{d} \mathrm{h}}{\mathrm{dt}}=\sin \left(35^{\mathrm{O}}\right) \frac{\mathrm{d} \mathrm{L}}{\mathrm{dt}}=\sin \left(35^{\mathrm{O}}\right)(10 \, \mathrm{ft} / \mathrm{sec}) \approx 5.7 \, \mathrm{ft} / \mathrm{sec}