Elementary Geometry for College Students (6th Edition)

$911.7$ ft
$350\times15=5250$ In $15$ seconds, the airplane flew $5250$ feet. Let $h$ be the increase in altitude of the airplane in 15 seconds. $\sin10^{\circ}=\frac{h}{5250}$ $h=5250\times\sin10^{\circ}$ $h\approx911.7$