book Maths Puzzle Numerical Ability

I have a question.... how do I simplify the square root of 40?

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If the slope of a line is 2 and its y intercept is 5, what is the equation of the line? Each of three colleges sent one male and one female student to a conference. How many ways can the 6 students be seated in a row of 6 chairs if the students can sit in any order? How do I do this problem?