6 and 3000 is the answer for ur question would be 3000
U just have to find original amount (100%) and that is the amount he made last week.
For number 7 it’s basically 4x3 and 4x6 and for number 8 it’s 4x7 and 2x7
For number 9 it’s 5x3, 5x6, 5x2
Y= 1/2x + 8
i hope this helped