Explain how the basic units are combined to give the derived units of force, velocity and pressure and work

An object moves from the position +34m to the position -15m in 15 seconds. what is it's total displacement? what is it's average velocity?

Multiply or divide to make this english distance conversion. 174 inches = feet (14.5, 58, 2,088, 23)

Determine the moment of the force f about an axis extending between a and c. express the result as a cartesian vector. a is at the origin, c is at (4,3,0) and f = (4i + 12j -3k) lb coming out of b (4,3,-2).