book Maths Puzzle Numerical Ability

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

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book Other Question

Dominic rode his motorbike 20 min to Helen home, and then the two drove in a car 30 min to a beach 35 mi from Dominic's home. If the car speed was 10 mi/h faster than that of the m Suppose there is a collection of three or more two dimensional vectors. Provide an argument showing that the collection must be linearly dependent.