3a-2 is equivalent to (3a)-2
Hope my answer helped:)
C on that one which is the correct answer
Answer: 5.64 *10^2
Step-by-step explanation:
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.