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Math·Algebra·Linear functions

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A cooking school is offering a promotion where the first class is free, the second class is half off the regular price, and the remaining classes are regularly priced.

If the regular price of a class is $22.80, which function $f$ gives the total cost, in dollars, of $x$ classes taken using this promotion, where $x\ge 2$?

A

$f(x)=22.80(x-1)+11.40$

B

$f(x)=22.80(x-2)+11.40$

C

$f(x)=22.80(x-1)+11.40(x-2)$

D

$f(x)=22.80(x-2)+11.40(x-1)$