exam Maths Puzzle Numerical Ability

Suppose f(x)=3x^2-4x+5. Explain how f(9) differs from f(x)=9.

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Hi,
Can you help me with this math problem?
Decompose into partial fractions.
17.) 2x^2-24x+35/(x^2+2x-7)(x-2)

The answer should be 7x/x^2+2x-7 - 5/x-2 A nut mixture consists of almonds and cashews. Almonds are $4.98 per pound, and cashews are $6.98 per pound. How many pounds of each type of nut should be mixed to produce a 16 pounds selling for $5.73 per pound.