The possibility is 3 : 1/2 * 6/1 = 3/1
        
             
        
        
        
Answer:
One time
Step-by-step explanation:
In both the numbers 72 and 78, the place value of 7 is 70.
Hence, 7 in 72 represents one time the value of the 7 in 78. 
 
        
             
        
        
        
Equation: f(x)=(1/5)x^2 or f(x)=(0.2)x^2
Check:
f(0)=(1/5)(0)^2
f(0)=(1/5)(0)
f(0)=0✓
f(5)=(1/5)(5)^2
f(5)=(1/5)(25)
f(5)=5✓
        
             
        
        
        
One decade is 10 years+ 8 years is 18 total years
18 minus 9 is 9 years
Hope this helps