Answer:15
Step-by-step explanation:
Given
Craftsman sell 10 Jewelry set for $500 each
For each additional set he will decrease the price by $ 25
Suppose he sells n set over 10 set
Earning
Earning 

differentiate to get the maximum value

Equate
to get maximum value



Thus must sell 5 extra set to maximize its earnings.
I got the answer Antonio had a head start of 3 meters.
Answer:
the ablity to choose one is the right now
Step-by-step explanation:
They are called invertebrats