Final answer:
The slope of the ladder is 5.
Step-by-step explanation:
The slope of the ladder can be determined using trigonometry. The slope is the ratio of the vertical change (the height of the ladder) to the horizontal change (the distance from the ladder to the building).
To find the slope, we can use the formula: slope = vertical change / horizontal change.
In this case, the height of the ladder is 15 feet and the distance from the ladder to the building is 3 feet.
Therefore, the slope is 15/3 = 5.