book Maths Puzzle Numerical Ability

what is the reciprocal of 3 5/8?

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If someone could please help me with the following problem that would be great.
f(x)=2x^2-3x+7 g(x)=3x+5
19.f(g(x))
x + 4
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x2-9 4x-12


x + 4(x-3)
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(x+3)(x-3) 4(x+3)