David leaves the house to go to school. he walks 160m west and 290m north. to the nearest tenth, how far away is he from his starting point?

Same length is comparing because it’s saying its the same and not different

I’m not absolutely sure but i think it’s 7x6x5x4x3x2=5040 because as the first character you can take any of the 7 given then you are left with 5 then 6 then 4 etc.