exam Maths Puzzle Numerical Ability

Solve using the addition principle.

2x+8> x +10
The solution set is X X > __
Help me please again I do not understand what I am supposed to do with this.

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exam Other Question

The area of a square is represented by the expression 9x^2+30x+25, where x represents a positive integer. What is the smallest perimeter that the square can have? simplify each expression. Use positive exponents. (4xy^2)^4(2y)^-3