Answer:

Step-by-step explanation:
Given,
The profit in present month = $ 6,400,
Also, there is a loss of $ 4,700 in the next month,
So, the profit in the next month = -$ 4,700,
Note : Negative sign shows the loss.
Hence, the difference in profit between the two months
= Profit in present month - profit in next month

Which is the required expression.