Question

I narrowly answered the first question on my homework but for some reason EF really confuses me.

Answer 1

Solution

Part 1

For this case we can find DF with the following proportion formula:

$\frac{AC}{AB}=\frac{DF}{DE}$

And replacing we got:

$\frac{4}{2}=\frac{DF}{1.34},DF=2.68$

Part 2

$\frac{BC}{AB}=\frac{EF}{DE}$

And solving for EF we got:

$EF=1.34\cdot\frac{3}{2}=2.01$