1. If you use the parallelogram of forces you must calculate the length of a diagonal of the parallelogram. That is a side of a triangle of which you know 2 sides and the included angle = 180° - (110° - 35°) = 105°

Then use cosine rule

2. Consider the forces as vectors:

Now use vector addition to calculate the resulting force.

Use the components of the result vector to calculate the angle to the horizontal.