for number 1 , since she bought 9 doer rolls, you can just multiply 12×9 and get 108. then you can divide 108 by 4 to get that answer. for number 3, you can set 40=4x (x being the amount of shells that Cameron collected.) then I believe the answer should be 10 for mandy.... number 4 , do 72×2. then 14×6. you get $144 and $84. subtract to get that you have $70 worth of extra socks. now if you know that 1 pair costs $6 , and 14 pairs cost $84 , you have to find out how many extra socks that you have, I believe it's 10 or 11 extra socks. double check just in case