Question

I need the answer to this asap, plzz

Answer 1

`\mathrm{D.\:}√(126)`

Explanation:

All three triangles in the figure are similar. Therefore, we can set up the following proportion:

`(18)/(m)=(m)/(7)`

Cross-multiply to solve:

`m^2=18\cdot 7 = 126, \\\\m=\fbox{$√(126)$}`.