I attached a file with this post see it for the questions
What seems to be the problem here mexicool?
Tell me what you're mainly having trouble with and I'll do my best to help.
In regards to question three:
$\displaystyle \tan35=\frac{1200}{x}$
$\displaystyle x=\frac{1200}{\tan35}$
In regards to 2-a:
First find the measure of BC by the pythagorean theorem $\displaystyle a^2+b^2=c^2$
so what do ya need? Well, you need $\displaystyle BC^2+BD^2=CD^2$
but $\displaystyle BC=\sqrt{(16)^2-(7+4)^2}$
once you have found that value, you plug what you know into the above formula to find $\displaystyle CD$.
Then with this information, the Law Of Cosines tells us that if we have 3 sides of an oblique triangle, we can know the value of the angles.
Here's the formula
so let$\displaystyle AC=a$and let$\displaystyle CD=b$and let$\displaystyle AD=c$where cosine of gamma = $\displaystyle \cos{C}$
Plug all this stuff in and slove your triangle!