Solution
Part 1
We can find the angle on the following way:
[tex]\theta=\sin ^{-1}(\frac{50}{1200})=2.39º[/tex]
rounding we got 2º
Part 2
We can find the value of x like this:
[tex]\tan 60=\frac{x}{175}[/tex]
And solving for x we got:
[tex]x=175\cdot\tan (60)=303.11\operatorname{cm}[/tex]
rounding we got 303.11 cm
Part 3
For this case we can do the following
[tex]\theta=\tan ^{-1}(\frac{9}{20})=24.22º[/tex]
And rounded would be 24º
