In Exercises explain why the formula does or does not represent y as a function of x.
Exercise
The price y of a Christmas tree based on its height x if
• a 6-foot tree costs between $20 and $50;
• an 8-foot tree costs between $25 and $75;
• an 11-foot tree costs between $f00 and $200;
• a 13-foot tree costs $300 or more.
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