exam Maths Puzzle Numerical Ability

Could you please help me. In Marbles-R-Us they sell marbles in boxes. Zeeshan buys 9 bags, each containing q marbles. On the way home he plays Mark and wins 9 more marbles. What is the expression for this? Thank you.

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Please help me solve by graphing:
3x-y < 2
x + y >2

and

x -2y is less than or equal to 4
x greater than or equal 1 The distance of a body from a point is given by s = xsin(&#969;t + &#945;)
Show that the velocity & acceleration are given by v = x&#969;cos(&#969;t + &#945;) & &#945; = &#969;^2s