exam Maths Puzzle Numerical Ability

Hi,
I need help with the following:

If P = 3y + 7xy - 2x and Q = 9 - 2y, find the value of 3P - 4Q.

Translate the following problems into algebraic equations. It is not req

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A company has a trail bike for sale at $1750.The company allows a teenager a trade in of $150 on an old motorcycle.How much would have to repaid each month if the teenager takes ou Thank you hard working folks in advance figured out the points where the grap goes however I need assistance figuring out the doman and range.
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Given the above graph,