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A museum charges $7 per person for a guided tour with a group of 1 to 11 people or a fixed $84 fee for a group of 12 or more people. Write a function relating the number of people, n, to the cost, C.

` C(n)= {( ),( ),( ):}`   if `0<n <`
  if `n≥`

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MathQuill
   x  x  √  n√  |   | (   ) π ∞ DNE
   x  √  (   ) π ∞ DNE
( ) ( ] [ ) [ ] —∞ ∞ ∪ DNE
< > ≤ ≥ or All Real Numbers DNE
log logn ln n√  | | e 
sin cos tan arcsin arccos arctan ⟨ ⟩
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