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Free body diagram incoming..

Any vector is just the sum of its horizontal and vertical components. See:

So y = 21 N * sin (15) = 5.44

*recall sin(x) = O/H

For the second problem you do the same thing, draw a fbd, decompose the force vector

for second question horizontal force is 10545* cos 31 = 9038.83 N

thank u guys for explaining it