book Maths Puzzle Numerical Ability

I need to find f o g(x) and g o f(x).
f(x)=3x^2-5 g(x)= 8/x
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Find the equation of a line that contains the point (-2,4)and is parallel to
y=2x-3
thank you for your time. i need help on this kind of question. theres 4 numbers 3,3,5,6 and 4 signs there are - + {} to the pweroer of 2.the answer is 27 but ineed to know how to get that answer.