exam Maths Puzzle Numerical Ability

will you help me with these three problems?

6y+10>8-(y+14)

4.6(x-3.4)>5.1x

-5x-(2x+3)>1

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exam Other Question

Geometry. A triangle has sides 3x + 7, 4x - 9, and 5x + 6. Find the polynomial
that represents its perimeter.

thank you
Is the following trinomial a perfect square?
x2 – 4x + 4