Vector A is 120 cointer wise magnitud 100 and vector B 210 degrees and magnitud

Question

Vector A is 120 cointer wise magnitud 100 and vector B 210 degrees and magnitud 50.
First my instructor wants all my abswer in exact form no decimal If it is in root leave like a root but try to simplify.

I have to calculate A + B = C and A - B = C .
C must present Magnitud, Cx, Cy and degree

I get stack in Cx = -50 - 25 sq root of 3 and Cy = 50 sq root of 3 - 25 ( this is the adition what Do I in the substraction?)

To calculate the Magnitud do I use the distance or phytagorean. How do i resolve it
without using a calculator giving an exact answer and simplifyinfg. How do I calculate the degree exact answer no decimals pleasr

Explanation / Answer

   Please be clear, whether you want solution graphically of mathematically.

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