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1) What is the magnitude of a?

2) What is the angle between vector b and the positive x-axis?

3) What is the magnitude of the vector a + b?

I Have NO CLUE How to Even APPROACH this Problem. It's killin' me too cuz it looks SO EASY.. I was thinkin of trying to solve for a by the substitution method of solving a simultaneous equation..but then I'd be left with an answer with a variable in it..(?)..I'm really growing to hate physics with a passion!