book Maths Puzzle Numerical Ability

solve :

3x^2+ 2x - squareroot 3 =0

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Suppose that in a company with 5000 employees, the monthly salaries are normally distributed. The mean salary is $3200, with a standard deviation of $600. About how many of the e Help me please find the term of the expansion (x-y)^8 that contains y^7 and simplify it. Thank you so much!