exam Maths Puzzle Numerical Ability

a sphere has a radius of 4. find the surface area

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can you help me solve this problem

Solve and write the answer in set notation
/3x-6/>3

Here is my answer
3x-6>3 3x-6>-3
3x-6+6>3+6 3x-6+6>-3+6
3x>9 3x>3
3x/3>9/3=x>3 3x/3>3/3=x>1

{x/x>3} when you are subtracting a matrices how do you change the signs