help.. on lecture 8. i am reading section 2.2 [Analysis of basic operations ] and i can't understand some phrases: If you use the same loop to “add” a list of strings, the run time is quadratic because string concatenation is linear.(why?),
Sorting is O(n logn). (how?) , Most string and tuple operations are linear, except indexing and len, which are constant time.(why big O('len') operation is constant?)

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