## Precalculus (6th Edition) Blitzer

$35.7^\circ$
With the given conditions, we can form a right triangle with a vertical side of $35$ and a hypotenuse of $60$. The elevation angle $\theta$ satisfies $sin\theta=\frac{35}{60}\approx0.5833$. Thus $\theta=asin(0.5833)\approx35.7^\circ$