exam Maths Puzzle Numerical Ability

please help me with this equation
b-(1-2b)+(b-3)=-4

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exam Other Question

For the angle for two vectors in the 3rd and 4th quadrant. To get the correct answer do you have to add 360. As you would add 180 if the vector was in the 2nd and 3rd quadrant. Usi For f(x)=√(x-3) and g(x)=x^3

a) the domain of f

b) the domain of g

c) (f-g)(x)

d) (fg)(x)

e) the domain of (f/g)(x)