Answer:
The angle complies with the state regulations. 
Step-by-step explanation:
The angle of elevation is the angle  in the figure, and from trigonometry we find that
 in the figure, and from trigonometry we find that 

taking the inverse sine of both sides we get 

which gives

which is less than 5°, and therefore is well within the state regulations. 
 
        
             
        
        
        
It's 12x. you just combine both numbers
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
HERE ARE THE ANSWERS
 
        
             
        
        
        
Answer:
Volume = 35185.8 
Step-by-step explanation:
Recall the formula for the volume of a cone: 
Where R is the radius of the cone's circular base (in your case half of 80 km,(that is 40 km)
And h stands for the height of the cone (in your case 21 km)
We replace such in the formula and calculate its final value:

We round it to the number of decimals your problem request (let's say to one decimal) and also include the cubic units:
Volume = 35185.8 