Since it had 49 members by week 7, you would do 49/7. That would be 7, so by each week the club got 7 new members. So week one would be 7, then 14, then 21 and so on and so forth.
Since 7x7=49 it will be 7 cause 49 divided by 7 IS 7.
Hope I helped!!!
6.4m questions
8.4m answers