First you would need to 8x5 witch is 40 so 40 would be you're answer to week 5.
Then do the same with week 6 so you'd do 8x6 witch is 48 so 48 would be you're answer to week 6.
Finally for week 7 you would do 8x7 witch is 56 so 56 would be you're answer to week 7 .
HOPE THIS HELPS