Answer:
18
Step-by-step explanation:
24*.75=18
 
        
                    
             
        
        
        
Step-by-step explanation:
x = father's age now
y = son's age now
x = 2y + 10
x - 20 = 5(y - 20) = 5y - 100
using the first in the second equation :
2y + 10 - 20 = 5y - 100
-10 = 3y - 100
90 = 3y
y = 30
x = 2y + 10 = 2×30 + 10 = 60 + 10 = 70
the father is now 70 years old, the son now 30 years old. 
 
        
             
        
        
        
Answer:
4
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
- No
- Yes
- Yes
Step-by-step explanation:
The first one is incorrect because would be 4,836,000 instead of 4,836,000,000. The correct notion would be 
 
        
             
        
        
        
Answer:
false
Step-by-step explanation: