book Maths Puzzle Numerical Ability

4x+3y<6
x-2y>4

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book Other Question

evaluate the given functions:
1) x=0.98
2) x=3^1/2 / 8 evaluate
i^22
and
i^31

simplify with imaginary numbers
square root -256
(31i-2)5i
(squareroot6+i)(squareroot6-i)
thanks