Answer: c. -5
Explanation:
Given: The bottom of the ladder is 4 feet from the wall .
i.e. Run on graph= 4
The top of the ladder reaches 20 feet above the ground.
i.e. Rise on graph = -20
We know that the slope of a line on graph is given by :-
![\text{Slope}=\frac{\text{Rise}}{\text{Run}}\\\\\Rightarrow\ \text{Slope}=(-20)/(4)=-5](https://img.qammunity.org/2019/formulas/mathematics/middle-school/ulv0ti2r001hnn0vhdw2892jwk0um9371q.png)
Hence, the slope of the graph = -5