Find the distance between P1 (7, 217/180 pi) and P2 (5, -23/36 pi) on the polar plane. ( show work)

A 2600-pound truck is stopped at a red light on a hill with an incline of 25 degrees. ignoring the force of friction, what force is required to keep the truck from rolling down the hill? (show work)

An airplane is taking off headed due north with an air speed of 173 miles per hour at an angle of S47 degrees E. Find a vector that represents the resultant velocity of the plane relative to the point of takeoff. Let i point east, j point north, and k point up. (show work)