If a pine tree grows 4 inches per year, how long will it take for the tree to reach a height of 13 feet? 
       
      
                
     
    
    
    
    2  answers:
            
              
Answer: 
Should be 39 years.
there is 12 inches in a foot. and if the tree grows 4 inches every year, then in 3 years the tree would be 1 foot. 13 x 3 = 39, thus proving that in 39 years, it will be 13 feet tall. I may be wrong but this sounds correct.
 
                                
             
                    
              
Answer: 
39 yr
Step-by-step explanation: 
Convert "4 inches per year" to "feet per year:"
4 inches       1 ft
-------------- * --------- = (1/3) ft/yr
   1 year        12 in
Now we know the growth rate.  The time required to reach a certain height is
 3 yr
-------- * 13 ft = 39 yr 
  1 ft
 
                                
             
         	
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