Walk off weight?

my mother and i walk anywhere between 2-4 miles almost every day. (sometimes i come home and walk another 1 or 2 on the tredmill). i'm hoping to get fit and healthy this summer, so i also do cardio things at home. but, i do have a couple questions .. 1-can you really "walk off the... show more my mother and i walk anywhere between 2-4 miles almost every day. (sometimes i come home and walk another 1 or 2 on the tredmill). i'm hoping to get fit and healthy this summer, so i also do cardio things at home. but, i do have a couple questions ..
1-can you really "walk off the weight"?

2-walking 2 miles, vs. running 1. which would be better? running because your heart rate goes up faster, walking cause its longer? i dont know :(

3-is it better to walk a mile, run a mile, walk a mile, run a mile, etc. or, walk a mile, walk a mile, run a mile, run a mile? which ones, and why?

thank all of you! :)
Update: i do eat healthy. me and my mom have created little things to help us, lol. thanks for everyones answers!
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