I can't tell you the answer because there is no image but to find a perpendicular lines slope you just take the slope and make it opposite. 
Ex: Slope is 1/2 what is the perpendicular? 
Ans: -2/1
 
        
                    
             
        
        
        
Let me help you!
It is important for the United States to build canals (wide canals) because the country is visited multiple times by hurricanes annually. Hurricanes are accompanied by heavy rainfalls and if left unchecked, causes flooding. The function of canals is to diffuse accumulated rainwater and direct it to greater bodies of water.
        
             
        
        
        
HI is most noticeable during the summer and winter. The main cause of the urban heat island effect is from the modification of land surfaces. Waste heat generated by energy usage is a secondary contributor. As a population center grows, it tends to expand its area and increase its average temperature.
 
        
             
        
        
        
Purple could mean many things but if it's talking about climate and such then cooler colors like purple are usually meaning colder climate
        
             
        
        
        
I think its corn because of the key below ?