Ireally really need with two math problems

The number of electoral votes each state is assigned is determined by the size of its population every ten years. the chart shows the number of electoral votes california was assigned each decade of the past century. what is the 3rd quartile of the data?

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

Which expression gives you the distance between the points (5,1)and(9,-6)