Tanya is 1.3 meters tall. she stands 7 meters in front of the tree and casts a shadow 1.8 meters long. how long is the tree

Let x be the height of the tree.
 
     1.3        x
    =  
     1.8        7
 
     1.8x = (1.3) (7)
   
     1.8x /1.8 =  9.1 / 1.8  (divide both sides of equation by 1.8)
   
      x  =  5.1 meters

ANSWER:  The tree is 5.1 meters tall.

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