Help T^T ion wanna fail this class

Use the data on the dot plot to answer the question.how many people read for more than three hours last week? i'm on a unit test review

In the diagram, points d and e are marked by drawing arcs of equal size centered at b such that the arcs intersect ba and bc. then, intersecting arcs of equal size are drawn centered at points d and e. point p is located at the intersection of these arcs. based on this construction, m , and m

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n