Guadalupe's car is stuck in the mud. Noah and Zach come along in a truck to help pull her out. They attach one end of a tow strap to the front of the car and the other end to the truck's trailer hitch, and the truck starts to pull. Meanwhile, Noah and Zach get behind the car and push. The truck generates a horizontal force of 398 lb on the car. Noah and Zach are pushing at a slight upward angle and generate a force of 139 lb on the car. These forces can be represented by vectors, as shown in the figure below. The angle between these vectors is 23°. Find the resultant force (the vector sum), then give its magnitude and its direction angle from the positive x-axis.
a. The resultant force is < , >
(Tip: omit degree notations from your answers; e.g. enter cos(45) instead of cos(45°))
b. It's magnitude is lb.
c. It's angle from the positive x-axis is °.