exam Maths Puzzle Numerical Ability

What is the square root of 165 rounded to the nearest tenth?

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I would really appreciate any help with this problem. If i learn this one i should be able to do the others following. Write a recursive rule for the sequence. The sequence may be arithmetic, geometric, or neither. 6,10,14,18,22.. How would I determine the maximum and minimum values of the following set of numbers:
3, -36/7, -1, -2/3, 5/4, 26/9