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Math·Algebra·Linear functions

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For groups of 5 or more people, a tour guide charges $9 for the first person in the group and $6 for each additional person. Which function $g$ gives the total charge, in dollars, for a tour with a group of $n$ people, where $n\ge 5$?

A

$g(n)=15n$

B

$g(n)=15n-9$

C

$g(n)=6n+3$

D

$g(n)=6n+9$