1)
Let's draw a diagram of the situation:
We can find h (The length of the ladder) using pythagorean theorem:
so:
[tex]\begin{gathered} c^2=a^2+b^2 \\ so\colon \\ c=\sqrt[]{4^2+22^2} \\ c=\sqrt[]{16+484} \\ c=\sqrt[]{500} \\ c\approx22.4ft \end{gathered}[/tex]
