I'll do the first two.
1.
Just use sine. Sine is equal to Opposite/Hypotenuse.
sin(x) = 24/40
Find the inverse sin of both sides:
x ≈ 36.90°
2.
You only know the side opposite and the side adjacent to angle M, so use tangent.
tan(x) = 27/36
Take the inverse of tangent of both sides:
x ≈ 36.90°
