Related Rates & Angle of Elevation Help??

1.) At time $t$ , we may state:

$\tan(\theta)=\frac{h}{100}$

Implicitly differentiating with respect to $t$ , and solve for $\frac{dh}{dt}$

We are given the conditions:

$\theta=\frac{\pi}{4}$

$\frac{d\theta}{dt}=\frac{1}{20}\,\frac{\text{rad}} {\text{s}}$

So, use these to find the value of $\frac{dh}{dt}$ , which represents the vertical speed of the balloon at the given point.

2.) Let x be the distance of the base of the ladder from the wall and y be the height of the top of the ladder on the wall. We may then relate the angle of elevation to these variables with

(1) $\tan(\theta)=\frac{y}{x}$

We also know by Pythagoras that:

(2) $x^2+y^2=5^2$

Differentiate (1) with respect to $t$ and solve for $\frac{d\theta}{dt}$ , and replace the resulting trig. function by its ratio definition.

Differentiate (2) with respect to $t$ to find $\frac{dx}{dt}$ .

Now, you should have everything you need to answer the question.