Answer: to know how to do bussiness
Step-by-step explanation:civil aviation has a lot of departments they dont work only in the air but they also work at the airport. they need math to do bussıness
 
        
             
        
        
        
Elga is 20 years old and Alvin would be 5. Hope this helped.
        
             
        
        
        
Answer:
Step-by-step explanation:
2(x-5)+2-3(5-2x)=16
2x-10+2-15+6x =16
8x-23 =16
8x =39
x = 39/8
 
        
             
        
        
        
Answer: 15 minutes
Step-by-step explanation:
60 / 4 = 15
15 * 3 = 45
45 / 3 = 15