Use this map to answer the questions, will reward with high points. 1. What is the scale ratio of the map?

6. What is the distance between point B and Z?

7. What is the gradient between Point B and Z? Show your calculations bellow:

This is a 2017 topographic map of puerto rico in the united states, and i'm sorry that people there have suffered such a disaster. i want to ask, what do the yellow dots and areas represent on this graph? and the blue area and the little blue circle, and the little blue sign that looks like a signal tower, what do they stand for?