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Shell gas station is having a sale on diesel. If you buy `4` gallons or less, you pay the regular price of `$4.09` per gallon. If you buy more than `4` gallons, you pay `$3.79` per gallon. Write a piecewise function for the price of `n` gallons of diesel at Shell.

` D(n)= {( ),( ),( ):}`   if `0<n ≤`
  if `n>`



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   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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