1) 1 yard = 3 feet
2) 39 feet * [1 yard / 3 feet] = 13 yard
3) 13 yard * $ 4 / yard = $ 52
Answer: he will pay $ 52 for the fabric.
4) strip diagram
|-----| 1 yard = $4
|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|
  1    2    3   4    5    6   7    8    9  10  11  12   13
          13 * 4 = 52 dollars
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