exam Maths Puzzle Numerical Ability

This problem is not in a textbook, it is from a worksheet the teacher handed out in class.
My ID number is quite remarkable. It's a 9-digit number with the digits 1-9 appearing o

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Part 1: Measure the distance of the diagonal (from one corner to the opposite corner) of the screen on your computer monitor to the nearest tenth of a centimeter or sixteenth of an Solve...
1.x^2=12
2.x^2-80=0
3.x^2+5=21
4.9x^2=14
5.(x-4)^2=3
6.(x+4)^2=4
7.5(x-2)^2=3
8.-9(x-3)^2=-7