Answer:
1600 dollars
Step-by-step explanation:
Find out how much you earn a month
1 month = 4 weeks
1 month = 100 x 4 = 400 dollars
Now find out 4 months
4 months = 400 x 4 = 1600 dollars
X has to be inside the radical.
It would be

Simplify the radical by breaking the radicand up into a product of known factors.
The correct answer is:
2u-v=7(5i-3j)
Therefore, 5, and 3 go inside the box.