book Maths Puzzle Numerical Ability

Suppose there is a collection of three or more two dimensional vectors. Provide an argument showing that the collection must be linearly dependent.

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book Other Question

Find the measure of each unknown angle in triangle ABC if angle a=(42-x)degrees
and b= ( 9x - 32)degrees
Please find A B and C

I am not even sure where to begin! Yikes please help me with this:

For a value of K, the expression x+k/x^2+kx-15 is undefined when x=5 and x=-3. Find the value of K