What might explain why the two students found different measurements for the length of the same side of the textbook?

One factor that could have been the cause of this was an error in measurement.  It could either be that the measuring instrument was not read from directly above (parallax error) or there could have been an error in estimation if the edge of the book does not lie on a measured line but instead between two of them thus resulting in the need for an approximation.

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:    

You need to re ask the question with proper