$30.$ Shadow Length Repeat Exercise $29$ for a man $6$ feet tall walking at a rate of $5$ feet per second toward a light that is $20$ feet above the ground $($see figure$).$ Figure for $30$ Figure for $31$

Angle of Elevation A balloon rises at a rate of $4$ meters

per second from a point on the ground $50$ meters from an

observer. Find the rate of change of the angle of elevation of

the balloon from the observer when the balloon is $50$ meters

above the ground.

dont forget to draw the graphs