Calculate Torque Vector for Force F at r - Dot Product

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Homework Statement

A force F=3i ̂+0.5j ̂-5k ̂(N)is applied to a partial located at r=2i ̂+4k ̂(m)
Determine the torque vector?

Homework Equations

The Attempt at a Solution

 

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Torque is defined as r cross F. Do you know how to compute a cross product?