book Maths Puzzle Numerical Ability

Dear Abbey can you help me with these problems? Show me a step by step way of doing it? 4x < 36
-4 < 36
4x >-36
Thank You very much!

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im trying to solve for varibles in a matrice:

[3x 4y] = [27 -16]
-48 49 -3w 7z
Simplify the radical expression:

I guess you could type it:

^4 (square root symbol)162x^5
_______________________________=
^4 (square root symbol)2x

the ________________