Dear teacher, I have a problem:

How is r parametrized in the task below? This is needed for finding W, which is given by:

W = ∫c F • dr.

7. Find the work done by the force field

F = (x + y)i + (x - z)j + (z - y)k

in moving an object from (1,0,-1) to (0,-2,3) along any smooth curve.

Best regards