Which of the following is NOT one of the methods Krakauer used to research his subject? A.
He gains personal accounts by those who knew and met his subject.
B.
He retraces the physical journey of his subject.
C.
He produces journal entries written by his subject.
D.
He conducts interviews with others who have attempted to do what his subject did.
E.
He produces government documents.

The answer is    (d) 7/2======we have    we also  have an integral      notice how function f splits up at x = 0. there's a left piece and a right pieceso we'll need to do the same thing with our integral: split it at x = 0we use a property of integrals that allows us to split up and sum:     notice that for the piecewise function f, the function has the equationf(x) = x when x  ≤ 0. so for the integral  , f(x) = x so it changes into      for the piecewise function f, the function has the equationf(x) = x+1  when x  > 0. for the integral  , we have    therefore, back to our splitted integral:    

Ibelieve the answer would be a