Physics
posted by Ray .
You are given a vector in the xy plane that has a magnitude of 70.0 units and a y component of 55.0 units. What are the two possibilites for its x component? Please explain, thanks! :)

x^2=70^255^2
x= + sqrt above. 
Thanks so much! I should have thought of the pythagorean therom, but why x^2=70^255^2 rather than x^2+(55^2)=70^2?

They both are the same thing. Solve for x^2 in your equation...
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