Answer
tower: 415 ft,
window: 152 ft
Work Step by Step
Using the diagram in the book, annotate
with $h_{1}$, the part of the tower above the line of eyesight, and
with $h_{2}$, the part below the line of eyesight.
Upper triangle:
$\displaystyle \tan 39^{o}=\frac{h_{1}}{325} \ \Rightarrow \ h_{1}=325\tan 39^{o}$
$h_{1}\approx $263.179810788$\approx$263 ft
Lower triangle:
$ h_{2}=325\tan 25^{o}\approx$151.5499889$\approx$ 152 ft
( which is also the height of the window)
The height of the tower is
$h_{1}+h_{2}\approx $263+152=415 ft
