exam Maths Puzzle Numerical Ability

1. Painting: A cylindrical tank has a radius of 6.5 ft. and an altitude of 14 ft. If a gallon of paint will cover 120 ft^2 of surface, how much paint is needed to put two coats of

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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} Solve:

2sinx+2cosx=sqrt2