One force of 100 units acts on an object . another force of 80 units acts on the object at a 40 degree angle from the first force. Find the

If we take the first force as acting in the x-direction then the x-component of the resulting force is 

Fx = 100 + 80*cos(40°)

The y-component of the resulting force is

Fy = 80*sin(40°)

 

The magnitude of the resulting force is 

F = √(Fx² + Fy²)

and the angle to the x-axis is

θ = tan^-1(Fy/Fx)

 

I'll leave you to fill in the numbers.