exam Maths Puzzle Numerical Ability

Can someone help me on this?
I need to find the first and third quartiles, Q1 and Q3, of the following set of numbers:

13,7,15,13,13,12,9,11,19,9

Thanks,
Lyn

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exam Other Question
can you please solve this by the substitution method?

y - 2x = -7.5
3x - 5y = 3.2

Thank you for your assistance. Factor the trinomial. Factor out all common monomials first.

9 x 3 - 9 x 2 + 2 x.