1. The problem statement, all variables and given/known data An object is at the origin. They're four perpendicular forces acting upon it. In the negative x axis, 18 N. positive x axis, 10 N. negative y axis, 8 N. and positive y axis 15 N. calculate the resultant force. What angle is it at? 2. Relevant equations F=Ma? 3. The attempt at a solution Not really sure how to get the resultant force. Do you just add 8+10-15-18? (since 15 and 18 are negative)? For the angle, would it be 90 degrees?