Get help with geometry similarity problems

Given:
\(\displaystyle\triangle{M}LN,\overline{{{M}{L}}}={13},\overline{{{M}{N}}}={6},\overline{{{N}{L}}}={10},\triangle{R}{Q}{S},\overline{{{R}{Q}}}={39},\overline{{{R}{S}}}={18},\overline{{{S}{Q}}}={30}\)
Find the scale factor from \(\displaystyle\triangle{M}LN\) to \(\displaystyle\triangle{R}{Q}{S}\).

Given: \(\displaystyle\overline{{{R}{S}}}\perp\overline{{{A}{B}}},\overline{{{C}{B}}}\perp\overline{{{A}{C}}}\)
Prove: \(\displaystyle\triangle{B}{S}{R}\sim\triangle{B}{C}{A}\)