A constant force, (2.17, -4.35, 1.45) N, acts on an object of mass 15.1 kg, causing a displacement of that object by (2.89, 3.95, -1.71) m. What is the total work done by this force?

Use W = \vec F \cdot \vec d.

Do you know how to calculate the dot product of the force and displacement vectors? If you have two vectors where \vec A = (A_x,A_y,A_z) and \vec B = (B_x,B_y,B_z), then the dot product is \vec A \cdot \vec B = A_xB_x + A_yB_y + A_zB_z .