3.7 Henry Hacker, a professional golfer who was having some trouble with his driver, decided to skip the next two tournaments on the PGA tour to work with his swing coach. He paid his coach $1,000 and used $1,000 worth of golf balls. As a result, his driving must have improved considerably because he now hits his tee shots longer and straighter. What explicit and implicit opportunity costs did Henry incur during the time spent with his swing coach?