Astore charges their customers based on the number of items that they buy. jane bought four items and was charged $15 and george bought twelve items and was charged $39. write a function to model the cost based on the number of items you buy. then determine how much you are charged if you purchase 22 items.
a) f(x) = 3x + 3; f(22) = 69
b) f(x) = 3x + 3; f(22) = 65
c) f(x) = 3x + 3; f(6.33) = 22
d) f(x) = 1/3x+3; f(57)=22
s