physics question - answer is 233 N but idk how to do this

Question

A more aggressive snowboarder decides that rain is perfectly OK. She goes up to Snoqualmie Pass to board down the slopes in the rain. The angle of the slope is 36.0°. She is sliding down the slope with a friction force (due to the water) of 59.0 N and her total mass is 50.0 kg. Determine the net force.

Answer 1

So there are two forces along the slope. One is friction, pushing her backwards, the other is gravity, but because she's on a slope, the pushing her down the slope isn't as much as if she were in free fall. You would expect the force of gravity to be greater for a steeper slope. This force of gravity comes to be mgsinθ with θ = 36º.

So that's the force down the slope, and the force up the slope is friction, so now find the net force with those two forces.