Answer:
40
Step-by-step explanation:
Put 4 where x is and evaluate.
... f(4) = 3·4² -2·4
... f(4) = 3·16 - 8
... f(4) = 48 - 8 = 40
25 necklaces
each necklace brings $16 profit (20-4=16)
400÷ 16= 25
so, at 25 necklaces, there will be enough profit to break even after paying for the advertising.
Depends where. Normally it whould cost 17,500.
