exam Maths Puzzle Numerical Ability

The magnitude and direction of vectors u and v are given. Choose the correct magnitude:
u: magnitude 218, bearing 22o
v: magnitude 170, bearing 112o
W: u-v

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exam Other Question
Divide the following:

x^+2x-15 over 4x^ divided by x^-25 over 2x-10

Thanks for any help you can offer. How would you even begin to solve F(x)= (x+7) to the 1/3 power. please help