15 point! ? law of cosines. need smart student

I think it would be 83.0448 or 83º

Step-by-step explanation:

If X is the opposite of your hypotenuse then you would have to do inverse cos [a^2 +b^2 -c^2 all divided by 2ab]

so you would have the inverse cos of [8^2 +16^2 -17^2 divided by 2(8)(16)] which would give you 83º.

I hope this helped a little bit. Im sorry if it's wrong.

where are the choices?

b, i believe, but not sure.