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A bike would be closer to 20 pounds. 20 ounces is the approximate wait of a 20oz bottle of soda. A bike ways much more than a bottle of soda.
4! = 4*3*2*1 = 24 ways
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Possible combinations are: Bike alone Subway alone Bus alone Bike part way and subway the rest Bike part way and bus the rest Subway part way and bus the rest Using all three This makes 7 possible combinations. Taking different modes of transportation for different portions of the trip would multiply the number of possible combinations according to the number of subway stations and bus stops and their proximity to each other. Of course this leaves out the obvious possibility - and likelihood - that part of a journey will be on foot, which would yield 4 ways of using one mode of transportation, 6 ways of using two, 4 ways of using three and 1 way of using all four - for a total of 15.
Very many ways. Some of the things you can measure are its:volumeareadepthtemperaturetemperature gradient with depthrate of evaporationrate of absorption into the soilpurity