Vector Problems: Ans to A+B & A-B | Magnitude & Dir. vs West

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Vector A has a magnitude of 70 units pointing due west, and vector B has the same magnitude pointing due south. For the vector addition A + B, the correct magnitude is approximately 99 units at an angle of 45 degrees south of west. For the vector subtraction A - B, the magnitude remains the same, but the angle should be specified as 45 degrees north of west. The confusion arises from the proper specification of angles relative to due west.
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Hi i need help with some online homework but i can't seem to get the right answer.
Vector A has a magnitude of 70 units and points due west, while vector B has the same magnitude and points due south. Find the magnitude and direction of (a) A + B and (b) A - B . Specify the directions relative to due west.

for part a) i got mag = 99 with angle of 45 degreees south of west and b) same thing but north of west am i doing something wrong?
 
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Are you getting both a) and b) wrong, or just b)? You are likely not specifying the angle properly from the due west direction.
 

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