exam Maths Puzzle Numerical Ability

Please help me with these...thank you

The function, p(d) = 1 + d/33 gives the pressure, in atmospheres (atm) at a depth d in the sea (d is in feet). Note that p(0) = 1 atm, p(33

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i dont really understand this either really; x^2-9/x-2 * x^2-4/x-3
i think i solved it totally wrong since i first multiplied the top then the bottom and got x^4 - 13x^2 +36 / x^2 - x - 6.
could someone please show me how to solve it right? Anne has two solutions, one with 6% iron and one with 2% iron. How many liters of each solution should be mixed to create 16 Liters of a solution with 3% iron content?