exam Maths Puzzle Numerical Ability

I have been working on this problem and am having extreme difficulty, I would appreciate any help, thanks

3x4 - 81x the 4 should be small and above the x.

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exam Other Question

I need help with this: graph f(x)=-2(x+3)-2 How do I do this? Question

As many 8-cm diameter discs as possible are cut from a sheet of rectangular cardboard measuring 170 cm by 90 cm. Find the area of the sheet that is left.

Please help to solve this question.

Thank you very much.