Answer:  (or
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Step-by-step explanation: 
 The area of a rectangle can be calculated with the following formula:
 
 Where "l" is the lenght and "w" is the width.
 In this case we know that the length of a flowerbed is 4 times as long as its width. This can be expressed as:
 
We know that the width of the flowerbed is:
 
 Therefore, substituting the width into   , we get that the length is:
, we get that the length is:
  
 Finally we can substitute the width and the lenght into the formula for calculate the area of a rectangle:
  
 
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