11 pieces of 0.75 feet in length can gwen cut from the piece that is 8.25 feet in length. 
Step-by-step explanation: 
The given is, 
 Gwen has a piece of wood that is 8.25 feet in length 
 Gwen needs to cut pieces that are 0.75 feet in length 
Step:1 
 The formula to calculating number of pieces are, 
 
................................(1)
 where, T = Total length of the wood 
 L = Length of the wood piece 
 n = Number of pieces 
Step:2
 Substitute the values of T and L in equation,
 From given,
  T = 8.25 feet
 L = 0.75 feet
 Equation becomes,
 

 = 11
  n = 11 pieces
Result:
 11 pieces of 0.75 feet in length can gwen cut from the piece that is 8.25 feet in length.